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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ACF | Valve | Game Files | Steam Application Cache File | Valve Steam | Valve |
| .AIN | Valve | Game Files | Source Engine Compiled AI Nodegraph File | Valve Source SDK | Valve |
| .AMX | Valve | Plugin Files | AMX Mod Plugin File | Half-Life | Valve |
| .BLOB | Valve | Settings Files | Valve Steam Archive | Steam | Valve |
| .BMZ | Valve | Game Files | Portal Bonus Map Zip File | Portal 2 | Valve |
| .CRASH | Apple | System Files | Mac OS X Crash Log File | Steam | Valve |
| .CSD | Valve | Game Files | Steam Game Data Backup File | Steam | Valve |
| .CSM | Autodesk, Inc. | 3D Image Files | Character Studio Marker File | Steam | Valve |
| .CTX | Microsoft Corporation | Developer Files | Visual Basic Control Binary File | CtxConverter | Valve |
| .DEM | Valve | Game Files | Video Game Demo File | Counter Strike | Valve |
| .DMP | Microsoft Corporation | System Files | Windows Memory Dump File | Steam | Valve |
| .DMX | Valve | Video Files | Source Filmmaker Project File | Source Filmmaker | Valve |
| .EFX | j2 Global, Inc. | Data Files | eFax Document | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .EKV | Valve | Game Files | Left 4 Dead Game Data | Left 4 Dead | Valve |
| .FGD | Valve | Game Files | Forge Game Data File | Valve Source SDK | Valve |
| .GCF | Valve | Game Files | Game Cache File | Steam | Valve |
| .GOO | LucasArts Entertainment Company, LLC | Game Files | Jedi Knight: Mysteries Of The Sith Game Data | Jedi Knight: Mysteries of The Sith | Valve |
| .JRF | Unknown Developer | Game Files | The Jumbot Bot Level Navigation Data | Half-Life | Valve |
| .LAST | Valve | Data Files | Valve Steam Data | Steam | Valve |
| .LAYOUT | Apple | Settings Files | Apple MainStage Layout Data | Steam | Valve |
| .LMP | id Software | Game Files | Quake Engine Lump File | Left 4 Dead | Valve |
| .MANIFEST | Microsoft Corporation | System Files | Windows Application Manifest File | Valve Steam | Valve |
| .MAP | id Software | Game Files | Quake Engine Map File | Valve Hammer Editor | Valve |
| .MDL | MathWorks | Data Files | MathWorks Simulink Model | Half-Life | Valve |
| .MENU | id Software | Game Files | Quake 3 Engine Menu File | Steam | Valve |
| .MST | Corel | Settings Files | Corel Presentations Master Template File | Steam | Valve |
| .NAV | Valve | Game Files | Id Tech 3 Bot Navigation File | Counter Strike | Valve |
| .NCF | Valve | Game Files | No Cache File | Steam | Valve |
| .NPC | Nikon | Settings Files | Picture Control Utility Picture Control File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .OL | Valve | 3D Image Files | Valve Hammer Object Layout File | Valve Hammer Editor | Valve |
| .PCF | Blackstrip Studios | Font Files | PaintCAD Font | Valve Source SDK | Valve |
| .PHY | Autodesk, Inc. | 3D Image Files | 3ds Max Physique File | Valve Source SDK | Valve |
| .PKV | Valve | Compressed Files | Steam Package Data | Steam | Valve |
| .POP | Valve | Game Files | Team Fortress 2 Population File | Team Fortress 2 | Valve |
| .PTS | Avid Technology | Audio Files | Pro Tools Session | Half-Life | Valve |
| .PVI | Canon Inc. | Data Files | Canon Picture Browser Cache Index | Half-Life: Counter Strike | Valve |
| .PWF | Valve | Game Files | Counter-Strike PODBot Waypoint File | Half-Life: Counter Strike | Valve |
| .QC | Valve | 3D Image Files | Half-Life Model Compiler Script File | Half-Life | Valve |
| .RAD | Reality Pump Studios | Audio Files | Reality Adlib Tracker Module | Valve Source SDK | Valve |
| .RES | Valve | Settings Files | Valve Resource File | Half-Life | Valve |
| .RMF | Valve | Game Files | Hammer Rich Map Format | Valve Hammer Editor | Valve |
| .SID | Valve | Game Files | Steam Game Data Backup File | Steam | Valve |
| .SIM | Valve | Backup Files | Steam Game Backup Information File | Steam | Valve |
| .SIS | Valve | Backup Files | Steam Game Backup Information File | Steam | Valve |
| .SMD | Valve | 3D Image Files | Valve Studiomdl Data File | Half-Life | Valve |
| .SPR | Valve | Raster Image Files | Half-Life Sprite File | Half-Life | Valve |
| .TF2 | Valve | Game Files | Team Fortress 2 Data File | Team Fortress 2 | Valve |
| .VDF | Valve | Game Files | Valve Data File | Valve Source SDK | Valve |
| .VEH | Raven software | Game Files | Vehicle Data File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .VHV | Valve | Game Files | Valve Source Lighting File | Valve Source | Valve |
| .VMF | Valve | Game Files | Valve Map File | Valve Hammer Editor | Valve |
| .VMT | VMware | Settings Files | VMware Configuration File | Valve Source SDK | Valve |
| .VMX | VMware | Settings Files | VMware Configuration File | Valve Source SDK | Valve |
| .VOID | Valve | Game Files | Half-life Map Voids File | Half-Life | Valve |
| .VPK | Valve | Game Files | Valve Pak | Half-Life | Valve |
| .VTA | Valve | Graphic Files | Valve Face Flex File | Valve Source SDK | Valve |
| .VTX | Richard Bannister | Audio Files | VTX Chiptune File | Valve Source SDK | Valve |
| .VWP | Raven software | Game Files | Vehicle Weapon File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .WC | Valve | Settings Files | Valve Hammer Configuration File | Valve Hammer Editor | Valve |
| .XWV | Valve | Audio Files | Valve Xbox360 Audio Data | Valve Source SDK | Valve |
| .ZTMP | Valve | Game Files | Steam Compressed Game Resource File | Valve Steam HLDS Update Tool | Valve |
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