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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .BAK | Various Developers | Backup Files | General Backup File | TED5 | id Software |
| .BEX | Symantec Corporation | Data Files | PGP Binary Extracted Public Key | Doom | id Software |
| .BM2 | DynaVox Mayer-Johnson | Data Files | Boardmaker Interactive Board File | TED5 | id Software |
| .BOT | id Software | Game Files | Quake 3 Arena Bot AI Data File | Quake 3 Arena | id Software |
| .BSP | id Software | Game Files | Quake Engine Game Map File | GtkRadiant | id Software |
| .CK2 | id Software | Game Files | Commander Keen 2 Game Data | TED5 | id Software |
| .DEM | Valve | Game Files | Video Game Demo File | Quake 3 Arena | id Software |
| .DM2 | Interscape | Data Files | Toad Data Modeler 2 File | Quake 3 Arena | id Software |
| .DM3 | Gatan | Raster Image Files | DigitalMicrograph Image | Quake 3 Arena | id Software |
| .DPM | Avid Technology | Plugin Files | Pro Tools Plugin File | Quake | id Software |
| .DWD | DiamondWare Ltd. | Audio Files | DiamondWare Digital Audio File | Doom | id Software |
| .EFX | j2 Global, Inc. | Data Files | eFax Document | Quake 3 Arena | id Software |
| .JBL | id Software | Game Files | Doom Scene Add-on File | Doom | id Software |
| .LIT | Microsoft Corporation | eBook Files | Microsoft Reader eBook File | Quake | id Software |
| .LMP | id Software | Game Files | Quake Engine Lump File | Doom | id Software |
| .MAP | id Software | Game Files | Quake Engine Map File | GtkRadiant | id Software |
| .MD2 | Alcohol Soft | Disk Image Files | Alcohol Disk Image Segment 2 | Quake II | id Software |
| .MD3 | id Software | Game Files | Quake 3 3D Model | Quake 3 Arena | id Software |
| .MENU | id Software | Game Files | Quake 3 Engine Menu File | Quake 3 Arena | id Software |
| .MJ3 | id Software | Data Files | Id Software Online Sale File | Doom | id Software |
| .MTR | Knife Edge Software | Game Files | RealFight Radio Control File | Doom | id Software |
| .MUS | MakeMusic, Inc. | Audio Files | Finale Notation File | Doom | id Software |
| .NAV | Valve | Game Files | Id Tech 3 Bot Navigation File | Quake 3 Arena | id Software |
| .PDA | Molecular Devices | Data Files | SoftMax Pro Microplate Data Analysis File | Doom | id Software |
| .PK3 | id Software | Game Files | Quake 3 Engine Game Data File | Quake 3 Arena | id Software |
| .Q2RENDERER | id Software | Plugin Files | Quake 2 For Mac Renderer Plugin File | Quake II | id Software |
| .QC | Valve | 3D Image Files | Half-Life Model Compiler Script File | Quake 3 Arena | id Software |
| .QLE | id Software | Backup Files | Quake Object Oriented Level Editor (QOOLE) File | Quake | id Software |
| .QVM | Open Source | System Files | Q Virtual Machine | Quake 3 Arena | id Software |
| .QWD | id Software | Game Files | QuakeWorld Demo File | QuakeWorld | id Software |
| .RESOURCES | Microsoft Corporation | Developer Files | Microsoft Visual Studio Resource | Doom | id Software |
| .ROQ | id Software | Video Files | Id Software Game Video | Quake 3 Arena | id Software |
| .SHADER | id Software | Game Files | Quake 3 Arena Id Tech 3 Game Engine Shader File | Quake 3 Arena | id Software |
| .SOD | id Software | Game Files | Spear Of Destiny Data File | Spear of Destiny | id Software |
| .SOUNDS | id Software | Game Files | Quake 3 Engine Sound Definition File | Quake 3 Arena | id Software |
| .SPS | IBM | Data Files | SPSS Program File | Quake 3 Arena | id Software |
| .W3D | Adobe Systems Incorporated | Video Files | Adobe Shockwave 3D File | Wolfenstein 3D | id Software |
| .WAD | id Software | Game Files | Doom WAD File | Doom | id Software |
| .WAL | Nullsoft | Uncommon Files | Winamp Modern Skin | Quake 3 Arena | id Software |
| .WCF | Microsoft Corporation | Data Files | WebEx Saved Chat Session | Doom | id Software |
| .WEAP | id Software | Game Files | Quake 3 Engine Weapon File | Quake 3 Arena | id Software |
| .WL1 | id Software | Game Files | Wolfenstein 3D Data File | Wolfenstein 3D | id Software |
| .WL3 | id Software | Game Files | Wolfenstein 3D Registered Version File | Wolfenstein 3D | id Software |
| .WL6 | id Software | Game Files | Wolfenstein 3D Data File | Wolfenstein 3D | id Software |
| .XGC | id Software | Uncommon Files | GtkRadiant XML Game Config | GtkRadiant | id Software |
| .ZDK | id Software | Game Files | ZQuake Game Data | ZQuake | id Software |
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