InstanceFormats

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This is a list of all SimCity 4 Group IDs (GID) and the formats of their respective Instance IDs (IID) for each Group. To find a specific file type or Group ID, do a find inside this page and it should turn up unless it is a Group ID that is still unknown, or comes from a custom Lot or BAT. The reason custom Lots and BATs will not show up here is that the programs used to create these files generate custom Group ID's that are unique to the computer that generated the file, and uses this GID for these items. Consequently, there are as many Group ID's for Lots and BATs as there are content creators, and it would be impractical to list them here. However, those file types that support custom Group ID's will have an entry on this page indicating which custom GID they use. For information about these custom GID's, see the <GEN> and <mGEN> entries at the end of the page.

Format for GID/IID Entries

File Type 

<GID> - <Group Name>
        <instance in format 0xAABBBfCD>
         AA=blah
         BB=blah
         C=blah
         D=blah
  • Characters in the range of A-H are used to show variables that any IID fills. For example, AA for a given IID may be f3,a3,01,00, or any other 2 characters, and so forth.
  • A Lowercase letter or a number shows something that doesn't change.
  • Some IIDs have a value of 12345678. These predate the use of IID specs by Maxis, and are just placeholders. An Exemplar may have an IID of 00000005. This is a test ID used for automata or Sims. It can also be used for other things however.

Specification

A - D

AB 

8a5971c5 - UDI Sounds
           0xABBBBCCC
              A = Even number, 0-E
              B = Sound Group Family
              C = Sound Group ID

AE 

8a5971c5 - UDI Data
           0xABBBBCCC
              A = Even number, 0-E
              B = Data Family
              C = Data File ID

ATC 

2a2458f9 - Props Animation Collections
           0xAABB0000
              A = The animation type (light, sport, etc.)
              B = Animation for that type
49a593e7 - Non-prop Animation Collections
           0xAAABBB00
              A = What Sim/Animation this is for
              B = Action State of this Sim (same for each Sim/Animation)		
                   For example:
                   013 - Protestor holding up sign
                   018 - Protestor with loud speaker

AVP 

2a2458f9 - Props Single Animation 
           0xAAAA000B
              A = Instance data from ATC file
              B = Zoom Cycle (starting from 0 upwards at furthest seen zoom)
49a593e7 - Non-Prop Single Animation
           0xAAAAAA0B
              A = Instance data from ATC file
              B = Zoom Cycle (starting from 0 upwards at furthest seen zoom)

BMP 

6a1eed2c - Region tile layout bitmaps
           0xAABBBCCC
              A = Bitmap Family ID
              B = Image Class ID
              C = Incremental Bitmap ID
1d6962cf - SC4 Vanilla Internal Tool Bitmaps
           0xABBBBCDD
              A = Main Bitmap group
              B = Bitmap Type Family
              C = Class. ex. e = Standard button maps.
              D = Incremental ID
<gen> - Computer specific BAT generated overlay picture (small)
           0xAAAA0000
              A = <mGEN>

BSPEC 

aa5bcf57 - Bridge Specification Rules
           0xA000B0CC
              A = Is the Rule a Bridge Specification (1)
              B = Is the Rule a complex rule. (0)
              C = Incremental Hardcoded ID Starting at 1

Cohort 

07BDDF1C - Civic and Park Building Parents
           0xABBBBCCC (Automata Layer Cohorts)
              A = Even number, 0-E 
              B = Cohort Family
              C = Cohort ID
           0x0000000A (Main Usage Cohorts)
              A = Cohort ID
096E6739 - Vehicle Type Parents
           0x0000000A (Main Vehicle Cohorts)
              A = Cohort ID
           0xABBBBCCC (Automata Layer Cohorts)
              A = Even number, 0-E 
              B = Cohort Family
              C = Automata ID
096e6817 - Watercraft Parents
           0x0000000A
              A = Cohort ID
296e680f - Aircraft Parents
           0x0000000A
              A = Cohort ID
47bddf12 - Zonable Commercial Building Parents
           0xA00000BB
              A = Cohort Zone (if 0, main cohort)
              B = Cohort ID
67bddf0c - Zonable Residential Building Parents
           0xA00000BB
              A = Cohort Zone (if 0, main cohort)
              B = Cohort ID
690f693f - Data view Parents
           0xABBBBCCC
              A = Even number, 0-E 
              B = Data Family
              C = Cohort ID
6a297266 - MySim Parent
           0x0000000A
              A = MySim Cohort ID
7a4a8458 - Clouds Parent
           0x0000000A
              A = Tuning Cohort ID	
a7bddf17 - Zonable Industrial Building Parents
           0xA00000BB
              A = Cohort Zone (if 0, main cohort)
              B = Cohort ID
a8fbd372 - Building Foundations
           0xABBBBCCC
              A = Even number, 0-E 
              B = Foundation Family
              C = Foundation ID
c96e6806 - Crime Simulator
           0x0000000A (Main Sim Affectors)
              A = Incremental Affector ID
           0xABBBBCCC (Sim Cohorts)
              A = Even number, 0-E 
              B = Sim Family
              C = Sim ID
ca25875d - Ambience Layer
           0xABBBBCCC (Sim Cohorts)
              A = Even number, 0-E 
              B = Ambience Family
              C = Ambience Type ID
ca386e22 - Landmark Parent
           0xABBBBCCC (Sim Cohorts)
              A = Even number, 0-E 
              B = Landmark Cohort Family
              C = Cohort ID

Config 

49dd6e08 - SimCity Configuration File (.cfg)
           0x0000000A
              A = Config File Number. Only config file 1 currently exists.

Corrupt 

a8fbd372 - Corrupt Building Lot Exemplar
           Instance as per file.

Cursor 

00000001 - Black & White Cursors
           0xAAAAABBB
              A = Main Cursor type (same for each bit depth)
                Types are randomly chosen and are hardcoded
              B = Incremental Cursor Identifier (same for each bit depth)
                Identifiers are randomly chosen but usually increment
                  In integers sequentially, for example: 770 = northeast, 771 = east.
00000004 - 4bit Cursors
           0xAAAAABBB
              A = Main Cursor type (same for each bit depth)
                Types are randomly chosen and are hardcoded
              B = Incremental Cursor Identifier (same for each bit depth)
                Identifiers are randomly chosen but usually increment
                  In integers sequentially, for example: 770 = northeast, 771 = east.
00000008 - 8bit Cursors
           0xAAAAABBB
              A = Main Cursor type (same for each bit depth)
                Types are randomly chosen and are hardcoded
              B = Incremental Cursor Identifier (same for each bit depth)
                Identifiers are randomly chosen but usually increment
                  In integers sequentially, for example: 770 = northeast, 771 = east.
00000032 - 32bit Cursors
           0xAAAAABBB
              A = Main Cursor type (same for each bit depth)
                Types are randomly chosen and are hardcoded
              B = Incremental Cursor Identifier (same for each bit depth)
                Identifiers are randomly chosen but usually increment
                  In integers sequentially, for example: 770 = northeast, 771 = east.

DBPF 

6a5b7b57 - DBPF Data files
           0xAAAABBBB
              A = Family ID (usually existing) Has no purpose towards function
              B = Unique ID
                These IIDs are hardcoded. The reason for picking an existing
                  Family ID in most cases is probably just for convenience.

DIR 

e86b1eef - Compressed File Directory
           0x286b1f03 - Instance code for DBPF Directory.

E - K

Effect Dir 

ea5118b1 - Effect Resource Tree
           0xAAAAAAAA
              A = Normally an incremental number from 0 upward, but with the Airforce plugin, Maxis randomly generated one.

Exemplar 

07BDDF1C - Exemplar - Civic and Park Buildings
           0xAAAABBBB
              A = Civic, Building Family
              B = Civic, Unused, for S3d Files
           0xABBBBCCC
              A = Even number, 0-E
              B = Park Family
              C = Park ID
084344E0 - Exemplar - Network Placement Tuning Parameters
           0xABBBBCCC
              A = Even number, 0-E
              B = Tuning Family
              C = Exemplar ID
088E1962 - Exemplar - Power Poles
           0xAA000BBB
              A = Network Type
              B = Pole Model ID
096E6739 - Exemplar - Land Vehicle Types
           0xAAAABBBB
              A = Vehicle ID
              B = Unused, for S3D's
           0xABBBBCCC (rarely used backup format)
              A = Even number, 0-E 
              B = Family
              C = Exemplar ID
096E6817 - Exemplar - Water Vehicle Types
           0xAAAABBBB
              A = Vehicle ID
              B = Unused, for S3D's
           0xABBBBCCC (rarely used backup format)
              A = Even number, 0-E 
              B = Family
              C = Exemplar ID
2821ED93 - Exemplar - Bridge Pieces Network Part Assignment
           0xAAAABBBB
              A = Bridge Pieces, Piece ID
                  Light Map, unused
              B = Bridge Pieces, unused, For S3D
                  Light Map, Piece ID
296E680F - Exemplar - Air Vehicle Types
           0xAAAABBBB
              A = Vehicle ID
              B = Unused, for S3D's
           0xAAAAAAAA (test exemplar)
              A = An S3D model.
2989FD57 - Construction Properties
           0xABBBBCCC (rarely used. backup format)
              A = Even number, 0-E 
              B = Family
              C = Exemplar ID
29B6C670 - Exemplar - Disasters
           0x0000000A
              A = Incremental disaster ID
           0xABBBBCCC (Rush Hour Disasters)
              A = Even number, 0-E 
              B = Family
              C = Exemplar ID
2A3858E4 - Exemplar - Menu Items
           0x00000AAA
              A = Menu Item ID
           0xAAAABBBB (Intersections)
              A = Intersection Family
              B = Intersection ID
2B79DFFB - Exemplar - Light Rail Pieces
           0xAAAAAAAA (test exemplar format)
              A = An S3D model.
           0xAABBCCDE - 3d Networks
              A = Network ID
              B = Piece ID
              C = Underlying Piece ID
              D = Sub ID for complex pieces
              E = Zoom of underlying piece
47BDDF12 - Developer: Commercial
           0xAAAABBBB
              A = Building Family ID
              B = Unused, for S3D's
67BDDF0C - Developer: Residential
           0xAAAABBBB
              A = Building Family ID
              B = Unused, for S3D's
67CD5FA1 - Exemplar - Building Behavior Simulators
           0xABBBBCCC (rarely used backup format)
              A = Even number, 0-E 
              B = Zone Family
              C = Developer ID
           0x0000AABB
              A = Zone Type
              B = Wealth Type
690F693F - Exemplar - Dataview and UDrive-It Interfaces
           0xABBBBCCC
              A = Even number, 0-E 
              B = Data View Family
              C = View ID
6A01FC2A - Exemplar - God Mode Terrain Tools
           0xABBBBCCC
              A = Even number, 0-E
              B = Terrain Modification Family
              C = Visual Effect ID
6A297266 - Exemplar - MySims
           0xABBBBCCC
              A = Even number, 0-E
              B = Sim Family
              C = Sim ID
7A4A8458 - Exemplar - Tuning Parameters/Background Loaders
           0xABBBBCCC
              A = Even number, 0-E
              B = Tuning Family
              C = Tuning Table ID
88CD66E9 - Exemplar - Fluid Dynamics Properties
           0x0000000A
              A = Dynamics Type ID
8974F80F - Exemplar - Supports
           0xAABBCCDD
              A = Main Network Type
              B = Piece Family
              C = Support Piece ID
              D = Unused, for Textures
89AC5643 - Exemplar - Transit Pieces (except light rail)
           0xABBBBCCC
              A = Even number, 0-E
              B = Piece Family
              C = Piece ID
89C2A517 - Exemplar - Textures
           0x000000AA
              A = Texture ID
8A3858D8 - Exemplar - Rewards
           0xAAAABBBB
              A = Building ID
              B = Unused, for S3D's		
A7BDDF17 - Developer: Industrial
           0xAAAABBBB
              A = Building ID
              B = Unused, for S3D's		
           0xABBBBCCC
              A = Even number, 0-E
              B = Field Family
              C = Field ID
A82CA30F - Exemplar - Bridge Pieces Main Definition
           0xAA0000BB
              A = Network ID
              B = Bridge ID
A8434037 - Exemplar - Highway Pieces Definitions
           0xAABBCCCC
              A = Network ID
              B = Bridge Piece Family
              C = Bridge Piece ID
A8FBD372 - Exemplar - Building Lots
           0xAAAABBBB
              A = Lot Family
              B = Lot ID
           0xABBBBCCC
              A = Even number, 0-E
              B = Lot Family
              C = Lot ID
A9189CF0 - Lighting Exemplar
           0x0000000A
              A = Exemplar ID
A998D30B - Automata Tuning Exemplar
           0x0000000A
              A = Tuning Exemplar ID
A9C2C209 - Exemplar - Ordinances
           0xABBBBCCC
              A = Even number, 0-E
              B = Ordinance Family
              C = Ordinance ID
C7BB4816 - Exemplar - Demand Simulator
           0x0AAAABCD
              A = Relation Family (R, CO, ID etc. Format: 00##)
              B = Data Class (Census, Workforce, etc)
              C = Wealth
              D = Data Type (EQ1,2,3 etc.)
C8DBCCBA - Exemplar - Utility Buildings
           0xAAAABBBB
              A = Building ID
              B = Unused, for S3D's		
C96E6806 - Exemplar - Crime Props
           0xAABB0000
              A = The animation type (light, sport, etc.)
              B = Animation for that type
           0xAAABBB00
              A = What Sim/Animation this is for
              B = Action State of this Sim (Same for each Sim/Animation)		
                    for example:
                      013 - Protestor holding up sign
                      018 - Protestor with loud speaker
           0xABBBBCCC
              A = Even number, 0-E
              B = Sim Family
              C = Sim ID
C977C536 - Exemplar - Props
           0xAAAABCCC
              A = LODs, Prop ID
                  Effect, Prop ID
              B = LODs, Foundation Flag
                  Effect, Effect number
              C = Unused, for S3D's
           0xABBBBCCC
              A = Even number, 0-E
              B = Prop Family
              C = Prop ID
CA25875D - Exemplar - Ambiance Layer Functionality
           0xABBBBCCC
              A = Even number, 0-E
              B = Layer Family
              C = Ambient ID
CA386E22 - Exemplar - Landmarks
           0xAAAABBBB
              A = Building ID
              B = Unused, for S3D's		
CA4AD545 - Exemplar - Graphs
           0x000000AA
              A = Graph ID
CB730FAC - Exemplar - Avenue Bridge Pieces Resources
           0xAAAABCCC
              A = Piece ID
              B = Section Flag (Support, or Connector)
              C = Unused, for S3D's
CBE084CB - Exemplar - One way Network Intersections & Road Tunnel
           0xAABBCC00
              A = Network ID
              B = Intersection Type
              C = Piece ID
E7E2C2DB - Exemplar - Simulators
           0xABBBBCCC
              A = Even number, 0-E
              B = Simulator Family
              C = Simulator ID
E8347989 - Exemplar - Rail & Highway Bridge Pieces Resources & Rail Tunnel
           0xAAAABCCC
              A = Piece ID
              B = Section Flag (Support, or Connector)
              C = Unused, for S3D's
E83E0437 - Exemplar - Trees
           0xAAAABBCC
              A = Flora Family
              B = Flora Type
              C = Flora ID
EA12F32C - Exemplar - Crimes
           0x000000AA
              A = Crime ID
EBE084C2 - Exemplar - 3D Transportation Pieces - Monorail/Light Rail
           0xAAAABB00
              A = Piece Family
              B = Piece ID
EBE084d1 - Exemplar - 3D Transportation Pieces - Ground Highway
           0xAAAA0000
              A = Piece ID
<gen>  - Computer specific Plugin Manager or PIM-X generated Group ID for custom content.
           0xABBBBCCC
              A = Even number, 0-E
              B = Lot Family
              C = Lot ID

FSH 

0986135E - FSH - Base and Overlay Textures
           0xAAAABCDE
              A = OverLay/Base ID
              B = Wealth
              C = Descriptor (Controls State, and things like Zone Tile Part Number's)
              D = Unused, or a 0 on the end of the Descriptor. Your Choice.
              E = Zoom
1ABE787D - FSH - Building Textures/Bridge Textures/Misc Textures/Network Textures
           0xAABBCCDE - Network Textures
              A = Network ID
              B = Piece Family
              C = Piece ID
              D = Border Texture Type
              E = Zoom
           0xAAAABCDE - LODs (Buildings, Props etc.)
              A = LOD ID
              B = Light (8 or sometimes 9) Flag
              C = Zoom
              D = Rotation
              E = Texture Frame
           0xAAAABCD0 - Flora
              A = Flora ID
              B = Light (8) Flag
              C = Zoom
              D = Model Variant
           0xAAAA000B - Graffiti (1dc##### in SimCity_2.dat)
              A = Graffiti ID
              B = Graffiti Flag (Should be set to 1)
           0xABBBBCCC - Sims, Automata, Fauna, Masks, and Clouds
              A = Even number, 0-E
              B = Texture Family (a624/a478 - clouds, c35f explosions)
              C = Texture ID
           0xAAAAB00C - Construction & Materials Textures
              A = Texture Group (Construction and Material)
              B = ID of Texture
              C = Zoom
2A2458F9 - FSH - Animation Sprites for Props
           0xAABB0000
              A = The animation type (light, sport, etc)
              B = Animation for that type
2BC2759A - FSH - Transit Piece Masks
           0xAABBCCCE
              A = Network ID
              B = Piece Family
              C = Piece ID 
              D = Zoom
49A593E7 - FSH - Animation Sprites non Props
           0xAAABBB00
              A = What Sim/Animation this is for
              B = Action State of this Sim (Same for each Sim/Animation)		
                   for example:
                     013 - Protestor holding up sign
                     018 - Protestor with loud speaker
891B0E1A - FSH - Terrain & Foundation Textures/Masks/Effect Textures
           0x0000AAAA - Terrain
              A = Texture ID
           0xABBBBCCC - Masks & Effects
              A = Even number, 0-E
              B = Texture Family
              C = Texture ID
           0xAAAA000B
              A = Foundation ID
              B = Zoom
cb6b7bd9 - Lot Editor Arrow Images
           0xAABBBBCC
              A = Image Group ID
              B = Image Family ID
              C = Image ID
46A006B0 - FSH - User Interface Images
           0xAABBBCCC
              A = Main Group
              B = UI/Menu Family
              C = Image ID
<gen> - Computer specific BAT generated Texture groupid
           0xAAAABCDE
              A = <mGEN>
              B = Normal Map (0) or Lighting Map (8)
              C = Zoom
              D = Rotation
              E = FSH frame number

HIT 

ca4d19e3 - HIT Audio Track Data
           0xABBBBCCC
              A = HIT Group
              B = HIT Family
              C = Unique ID
               Linked to TLO by Group ID. No Grouping. Single File.

HLS 

9dbdbf74 - Sound Hitlists
           0xABBBBCCC
              A = Even number, 0-E
              B = Hitlist Family
              C = Unique ID

INI 

4a87bfe8 - Font INI
           0xABBBBCCC
              A = Even number, 0-E
              B = Family ID (usually existing), has no purpose towards function
              C = Unique ID
               These IIDs are hardcoded. The reason for picking an existing Family ID in most cases is probably just for convenience.
8a5971c5 - Terrain Mapping & Path Remapping, Sound, and Features INI
           0xABBBBCCC
              A = Even number, 0-E
              B = Family ID (usually existing) Has no purpose towards function
              C = Unique ID
               These IIDs are hardcoded. The reason for picking an existing Family ID in most cases is probably just for convenience.

JFIF/JPEG 

ca133ecb - JPEG Art
           0xAaBBCCDE
              A = Main Picture Group
              B = Subgroup, for example: 5e = normal, 39 = horizontally squished
              C = Class, for example: 3e = In-game art
              D = Subclass, for example: D = RCI
              E = Picture ID
<gen> - Computer specific BAT generated overlay picture (large)
           0xAAAA0000
              A = <mGEN>

KEYCFG 

6a231eaa - Accelerator Tables
           0xAAAAAABB
              A = Key Family ID
              B = Key Map Member ID

L - R

LEV and XA (XAs currently in the LEV area) 

0a5bcda5 - Construction
           0xABBBBCCC
              A = Family ID of Sound. Sound groupings. Char 0-F
               May change in an LEV/XA group
              B = Sound Group for this Family (i.e. subway, farm)
               May change for files in an LEV
              C = Sound ID for this Group (i.e. loud subway, soft, etc.)
               For LEVs, this is usually higher than the last sound for that Group

The following Group ID's all use the same Instance Format described above:
0a627909 - Residential Bad Night Small/Medium
2a398e45 - Nature Night
2a6278ee - Residential Bad Day Large
4a392cff - Industrial Clean Bad
4a398e40 - Nature Day
4a42c073 - Traffic Midtown/Medium
4a54e37f - Pipe View
4a54e387 - Subway View
4a5e6ac5 - High Crime
4a5e7be3 - Farm Buildings
4a60ce67 - Farm Fields
4a627900 - Residential Bad Night Large
8a398e3c - Industrial Dirty Good
8a42b774 - Traffic Downtown
8a60ce80 - Traffic Street
8a60cf62 - Zoo
8a627912 - Residential Good Day Small/Medium $$$
aa39ba06 - Garbage
aa60ce7d - Traffic Road Light
ca398e36 - Industrial Dirty Bad
ca398e4a - Wind Zoom 1&2
ca62790f - Residential Good Day Small/Medium
ca88cc85 - Abandoned
ea39ba3e - Water
ea5e6ac2 - Traffic Jam
ea60ce77 - Traffic Highway
ea6278fd - Residential Bad Day Small/Medium
ea62790c - Residential Good Day
ea627915 - Residential Good Night Small/Medium
ea627918 - Zoom 3 City
ea62791b - Wind Zoom 3
ea398e29 - Industrial Clean Good

LogicObject 

ca4d19e3 - Track Logic Object (TLO)
           0xABBBBCCC
              A = Logic Object Associated Group
              B = Logic Object Associated Family ID
              C = TLO Unique ID

Lot Data (LD or LDAT) 

6be74c60 - Exchange Data for Lot
           0x0000000A
              A = 1. A hardcoded value for each lot file declaring the exchange file

LTEXT LTEXT files in plugins have incremental GID's to signify different languages to the .exe. 

EA5524EB - LTEXT - Misc. Item Names/Descriptions
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
EA231E96 - LTEXT - Misc. Texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
CA554B03 - LTEXT - Popup window HTML texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
8A635D24 - LTEXT - Audio file name to description texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
8A5E03EC - LTEXT - Disaster texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
8A4924F3 - LTEXT - About SC4 window HTML text
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
6A554AFD - LTEXT - Misc. Item Names/Descriptions
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
6A3FF01C - LTEXT - Game UI Texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
6A231EAA - LTEXT - Interactivity Feature Texts (MySim, UDriveIt, etc.)
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
6A231EA4 - LTEXT - News ticker message texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
4A5E093C - LTEXT - Terrain tool texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
4A5CB171 - LTEXT - Funny random city loading message texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
2A592FD1 - LTEXT - Item plop/draw notification texts
           0xA00000BB
              A = Text Type (A = intersection draws, F = Failed draws, and Tips)
              B = Text ID
0A554AF5 - LTEXT - Audio UI Panel texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
0A554AE8 - LTEXT - General UI texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
0A554AE0 - LTEXT - Item visible name and description texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
0A419226 - LTEXT - In game error texts
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
6a4eb3f7 - LTEXT - Population Text
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID
EAFCB180 - LTEXT - Plugin Install Text
           0xABBBBCCC
              A = Even number, 0-E
              B = Text Family
              C = Text ID

6a231eaa - De-Localizer - used to avoid language localization.
           Located in the same Group as LTEXTs, but not actually text.
           0a6df4df - IID for De-Localizer

LUA 

4A5E8EF6 - LUA - Missions, Advisors, Tutorials and Packaging files)
           0xAABBBBBB
              A = ff. The code for LUA script.
              B = 24 bit Hash for use in Dofiles
4A5E8F3F - LUA - Generators, Attractors, Repulsors, and System LUAs
           0xAABBBBBB
              A = ff. The code for LUA script.
              B = 24 bit Hash for use in Dofiles

MAD 

00000001 - Movie Files
           0xAAAAAAAA
              Incremental ID. Hardcoded for main dats.

PNG 

00000001 - PNG - Main Button Images
           0xAABBBCCC
              A = Main Group (13 = Bottom UI, 14 = Everything Else)
              B = UI/Menu Family
              C = Image ID
1ABE787D - PNG - User Interface (Button and Menu States, Query edges, States)
           0xAABBBCCC
              A = Main Group
              B = UI/Menu Family
              C = Image ID
22DEC92D - PNG - Built-In Tools User Interface
           0x0000AAAA
              A = Image ID (000#, 100#, 200#, and 300# series are used)
46A006B0 - PNG - UI Images (UDriveIt, Main Interface, MySim)
           0xAABBBCCC
              A = Main Group
              B = UI/Menu Family
              C = Image ID
4C06F888 - PNG - UDriveIt Icons
           0xAAAABB00
              A = Main ID (Either the vehicle or Sim the icon is concerned with)
              B = Transport ID (What vehicle or device is transporting the Sim)
6A1EED2C - Region View City Tiles
           0xAABBBCCC
              A = Tile Size
              B = Image Class (231 is Tile Maps)
              C = Image ID (For Tilemaps: Water, Land, Overlay)
6A386D26 - PNG - Menu Building Icons, Bridges, Overlays
           0xABBBBCCC - Menu images
              A = Image Grouping.
              B = Image Menu Family (Parks, Civic, etc.)
              C = Image Button ID (The specific ID of this Buildings Image)
           0xAA0000BB - Bridge Icons
              A = Network ID
              B = Bridge ID
           0x0000AAAA - Pinkscreen box overlay
              A = Arbitrary Image ID. Only used for a 'pinkscreen' image.
8b6b7857 - Lot Editor PNG Images
           0xAABBBBCC
              A = Image Group (Kind of image)
              B = Image Family (Where image will be used)
              C = Image ID
A9179251 - PNG - Art pictures and their Overlays
           0xAABBBCCC
              A = Main Group (09 for these pics)
              B = Art Image Family
              C = Image ID
AB7E5421 - PNG - MySim Thought Bubbles and Transit Icons
           0xAABBBCCC
              A = Bubble or Icon Group (B&W, Mood, Bubble Overlay)
              B = Bubble or Icon Family (For combo groups, subgroup)
              C = Bubble or Icon ID
ebdd10a4 - PNG - Lot Pictures
           0xABBBBCCC
              A = Image Grouping.
              B = Image Family
              C = Image ID (The specific ID of this building's image)

RUL 

aa5bcf57 - Network Rules
           0xA000B0CC
              A = Is the Rule a Bridge Specification (0)
              B = Is the Rule a complex rule (0)
              C = Incremental, hardcoded ID starting at 1
aa5bcf57 - Complex Network Rules
           0xA000B0CC
              A = Is the Rule a Bridge Specification (0)
              B = Is the Rule a complex rule (1)
              C = Incremental, hardcoded ID Starting at 1

S - Z

S3D 

badb57f1 - Simglide 3D Model
           0xAAAABCDE - Standard Instance Format
              A = LODs, LOD Model ID
                  Object, 3D Object ID (Cars, complex 3d objects, etc)
                  Arbitrary Assign, AssignID (All other values unused)
              B = LODs, Foundation flag (is foundation or not)
                  Object, TypeFlag (0 = vehicle, 1= rear light, 2 = vehicle lights, 3 = siren, 5 = General 3d model)
              C = LODs, Zoom
                  Object, unused
              D = LODs, Rotation
                  Object, unused
              E = LODs, unused
                  Object, Secondary Typeflag (as main type flag)
           0xAABBCCDE - 3D Networks
              A = Network Type (02 highway, 08 Light rail)
              B = Highway, Piece Class (00 Single or 01 Intersection)
                  El Rail/Light Rail, Piece ID
              C = Highway, Piece ID
                  El Rail/Light Rail, Underlying Network Piece ID
              D = Highway, SubID (for things like Clovers, the part of the clover)
                  El Rail/Light Rail, Where used, the SubID as above
              E = Highway, Zoom of Underlying Network Piece
                  El Rail/Light Rail, Zoom of Piece
           0xAAAABBCD - Advisors, Fauna
              A = Fauna, Fauna Family ID
                  Advisor, Advisor Class ID (2a42) or Mission ADV Classid (ec20)
              B = Fauna, Model State
                  Advisor, Normal (b5) or Llama (b6) or DrVu (24, for missions)
              C = Fauna, Use Seperate Alpha? Flag (0,1)
                  Advisor, Advisor Number
              D = Fauna, Map if Seperation flag is on (2 = alpha, 4 = normal)
                  Advisor, Advisor Mood
           0xAAAABBCC - UDI, Disaster, Simple 3D model
              A = Family ID
              B = UDI, State
                  Disaster, Disaster ID
                  Simple 3d Model, Model Class
              C = Model ID
<gen> - Computer specific BAT Generated S3D model
           0xAAAABCD0
              A = <mGEN>
              B = Foundation flag
              C = Zoom
              D = Rotation

SC4Path 

69668828 - Textured Networks Paths
           0xAABBCCDD
              A = Main Network Type
              B = Path Family (For roads, 01 = straight to diagonal intersection, 02 = odd cross)
              C = Network Piece ID
              D = Unused, for Textures
a966883f - 3D Networks Paths
           0xAABBCCDE
              A = Main Network Type
              B = Path Family
              C = Network Piece ID
              D = For Construct sections, the part of the construct network section
              E = Unused, for Textures where applicable
           0xAAAABCCC (for paths on lots)
              A = Building Family ID
              B = Foundation Flag (only used once in paths)
              C = Unused, for S3D LOD files

String 

55555555 - String Texts
           0xABBBBCCC
              A = Even number, 0-E	
              B = String Family 
              C = String ID

TRK 

2a4d1937 - Disaster, Destruction, Siren, Splash, Low Pitch Ambient Effect Sounds
           0xABBBBCCC
              A = Even number, 0-E
              B = TRK Family 
              C = TRK File ID

The following Group ID's all use the same Instance Format described above:
2a4d193d - Query Sounds
aa4d1920 - Activate Sounds, Audio Loop ID's, Ambience Decayed, and HLS Entries
aa4d1930 - Fireworks, Construction, Sims, UDI, Alien, Crowds, Animals Effects
ca4d1943 - UI Button Click & Plop Sounds & Wire,Fire, and Tools Effects
ca4d1948 - Occupant Instance Sounds
ea4d192a - Fireworks, Riots, Children, Anger, Demo, Crime, Construction, Jet Effects

UI 

08000600 - Main SC4 Interface
           0xABBBBCCC
              A = Even number, 0-E	
              B = UI Family (9923 = Main Menu Secondary Menu Bitmaps)
              C = UI ID
96a006b0 - All Game Interfaces except the main interface
           0xABBBBCCC
              A = Even ID 0-E
              B = UI Family (c1d7 = UDI Control Windows)
              C = UI ID
1d6962cf - SC4 Vanilla Internal Tool Interfaces
           0xAAABBBBB
              A = UI group. 'ace' is standard
              B = Incremental ID starting from 0 as needed
cb6b7601 - Lot Editor UI's
           0xABBBBCCC
              A = Even number, 0-E	
              B = UI Family 
              C = UI ID

WAV 

0a4d1926 - School bell and fire engine
           0xABBBBCCC
              A = Family ID of Sound. Sound groupings.
              B = Sound Group for this Family (i.e. subway, farm)
              C = Sound ID for this Group (i.e. loud subway, soft, etc.)
6a4d193a - Fire and Obliterate Sounds
           0xABBBBCCC
              A = Family ID of Sound. Sound groupings.
              B = Sound Group for this Family (i.e. subway, farm)
              C = Sound ID for this Group (i.e. loud subway, soft, etc.)

XA 

0a4d1926 - Activate Sounds & Audio Loop ID
           0xABBBBCCC
              A = Family ID of Sound. Sound groupings.
              B = Sound Group for this Family (i.e. subway, farm)
              C = Sound ID for this Group (i.e. loud subway, soft, etc.)

The following Group ID's all use the same Instance Format described above:
0a4d192d - Fireworks,Riots, Children, Anger, Demo, Crime,Construction, Jet Effects
0a627909 - Residential Bad Night Small/Medium
2a4d1940 - Query Sounds
2a6278ee - Residential Bad Day Large
4a4d1946 - Plop & Button Click & Ambience Decay & Wire,Fire and Tools Effects
6a4d193a - Disaster, Destruction, Siren, Splash, Low Pitch Ambient Effect Sounds
8a627912 - Residential Good Day Small/Medium $$$
aa4d1933 - Fireworks, Construction, Sims, UDI, Aliens, Crowds, Animals Effects
aa4d194b - Occupant Instance Sounds

XML 

<gen> - Computer specific Lot Description XML file
           0xAAAAAAAA 
              A = Same as applicable parent file for each of .SC4model, Lot, Desc
                  For example, Model = main S3D, Lot = main exemplar, Desc = main exemplar

<GEN> and <mGEN>

<GEN> and <mGEN> are generated ID's that are specific and unique to a computer and are designated at the time that particular modding tools are installed. The Model ID <mGEN> is the first 2 bytes of the Instance ID of models and textures. The Group ID <GEN> is the custom GID for the models, textures, exemplars, xml's and pictures created on that particular computer. Its purpose is to add yet another random factor to building design so that buildings don't conflict (due to the fact that the TGI's follow standard naming). The <GEN> is designated using the following method: a huge random number over 2^29 DWORD is overlayed with a bit flag by a DWORD of timestamp starting around 1997 (the time EA bought Maxis). The generated Model ID <mGEN> is an incremental number that represents the building Family ID. It starts at 0001.

A note on 1 character Family, "Even" or Group IDs as seen in various instances. These appear to be used some times specifically, however they go from 0 to E and often appear randomly chosen as a way to vary the instances more.

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