| .ACF | Valve | Arquivos de jogos | Steam Application Cache File | Valve Steam | Valve |
| .AIN | Valve | Arquivos de jogos | Source Engine Compiled AI Nodegraph File | Valve Source SDK | Valve |
| .AMX | Valve | Arquivos de complementos | AMX Mod Plugin File | Half-Life | Valve |
| .BLOB | Valve | Arquivos de configuração | Valve Steam Archive | Steam | Valve |
| .BMZ | Valve | Arquivos de jogos | Portal Bonus Map Zip File | Portal 2 | Valve |
| .CRASH | Apple | Arquivos de sistema | Mac OS X Crash Log File | Steam | Valve |
| .CSD | Valve | Arquivos de jogos | Steam Game Data Backup File | Steam | Valve |
| .CSM | Autodesk, Inc. | Arquivos 3D | Character Studio Marker File | Steam | Valve |
| .CTX | Microsoft Corporation | Arquivos de desenvolvedor | Visual Basic Control Binary File | CtxConverter | Valve |
| .DEM | Valve | Arquivos de jogos | Video Game Demo File | Counter Strike | Valve |
| .DMP | Microsoft Corporation | Arquivos de sistema | Windows Memory Dump File | Steam | Valve |
| .DMX | Valve | Arquivos de vídeo | Source Filmmaker Project File | Source Filmmaker | Valve |
| .EFX | j2 Global, Inc. | Arquivos de dados | eFax Document | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .EKV | Valve | Arquivos de jogos | Left 4 Dead Game Data | Left 4 Dead | Valve |
| .FGD | Valve | Arquivos de jogos | Forge Game Data File | Valve Source SDK | Valve |
| .GCF | Valve | Arquivos de jogos | Game Cache File | Steam | Valve |
| .GOO | LucasArts Entertainment Company, LLC | Arquivos de jogos | Jedi Knight: Mysteries Of The Sith Game Data | Jedi Knight: Mysteries of The Sith | Valve |
| .JRF | Unknown Developer | Arquivos de jogos | The Jumbot Bot Level Navigation Data | Half-Life | Valve |
| .LAST | Valve | Arquivos de dados | Valve Steam Data | Steam | Valve |
| .LAYOUT | Apple | Arquivos de configuração | Apple MainStage Layout Data | Steam | Valve |
| .LMP | id Software | Arquivos de jogos | Quake Engine Lump File | Left 4 Dead | Valve |
| .MANIFEST | Microsoft Corporation | Arquivos de sistema | Windows Application Manifest File | Valve Steam | Valve |
| .MAP | id Software | Arquivos de jogos | Quake Engine Map File | Valve Hammer Editor | Valve |
| .MDL | MathWorks | Arquivos de dados | MathWorks Simulink Model | Half-Life | Valve |
| .MENU | id Software | Arquivos de jogos | Quake 3 Engine Menu File | Steam | Valve |
| .MST | Corel | Arquivos de configuração | Corel Presentations Master Template File | Steam | Valve |
| .NAV | Valve | Arquivos de jogos | Id Tech 3 Bot Navigation File | Counter Strike | Valve |
| .NCF | Valve | Arquivos de jogos | No Cache File | Steam | Valve |
| .NPC | Nikon | Arquivos de configuração | Picture Control Utility Picture Control File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .OL | Valve | Arquivos 3D | Valve Hammer Object Layout File | Valve Hammer Editor | Valve |
| .PCF | Blackstrip Studios | Arquivos de fonte | PaintCAD Font | Valve Source SDK | Valve |
| .PHY | Autodesk, Inc. | Arquivos 3D | 3ds Max Physique File | Valve Source SDK | Valve |
| .PKV | Valve | Arquivos comprimidos | Steam Package Data | Steam | Valve |
| .POP | Valve | Arquivos de jogos | Team Fortress 2 Population File | Team Fortress 2 | Valve |
| .PTS | Avid Technology | Arquivos de áudio | Pro Tools Session | Half-Life | Valve |
| .PVI | Canon Inc. | Arquivos de dados | Canon Picture Browser Cache Index | Half-Life: Counter Strike | Valve |
| .PWF | Valve | Arquivos de jogos | Counter-Strike PODBot Waypoint File | Half-Life: Counter Strike | Valve |
| .QC | Valve | Arquivos 3D | Half-Life Model Compiler Script File | Half-Life | Valve |
| .RAD | Reality Pump Studios | Arquivos de áudio | Reality Adlib Tracker Module | Valve Source SDK | Valve |
| .RES | Valve | Arquivos de configuração | Valve Resource File | Half-Life | Valve |
| .RMF | Valve | Arquivos de jogos | Hammer Rich Map Format | Valve Hammer Editor | Valve |
| .SID | Valve | Arquivos de jogos | Steam Game Data Backup File | Steam | Valve |
| .SIM | Valve | Arquivos de cópia | Steam Game Backup Information File | Steam | Valve |
| .SIS | Valve | Arquivos de cópia | Steam Game Backup Information File | Steam | Valve |
| .SMD | Valve | Arquivos 3D | Valve Studiomdl Data File | Half-Life | Valve |
| .SPR | Valve | Arquivos de imagem Raster | Half-Life Sprite File | Half-Life | Valve |
| .TF2 | Valve | Arquivos de jogos | Team Fortress 2 Data File | Team Fortress 2 | Valve |
| .VDF | Valve | Arquivos de jogos | Valve Data File | Valve Source SDK | Valve |
| .VEH | Raven software | Arquivos de jogos | Vehicle Data File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .VHV | Valve | Arquivos de jogos | Valve Source Lighting File | Valve Source | Valve |
| .VMF | Valve | Arquivos de jogos | Valve Map File | Valve Hammer Editor | Valve |
| .VMT | VMware | Arquivos de configuração | VMware Configuration File | Valve Source SDK | Valve |
| .VMX | VMware | Arquivos de configuração | VMware Configuration File | Valve Source SDK | Valve |
| .VOID | Valve | Arquivos de jogos | Half-life Map Voids File | Half-Life | Valve |
| .VPK | Valve | Arquivos de jogos | Valve Pak | Half-Life | Valve |
| .VTA | Valve | Arquivos Gráficos | Valve Face Flex File | Valve Source SDK | Valve |
| .VTX | Richard Bannister | Arquivos de áudio | VTX Chiptune File | Valve Source SDK | Valve |
| .VWP | Raven software | Arquivos de jogos | Vehicle Weapon File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .WC | Valve | Arquivos de configuração | Valve Hammer Configuration File | Valve Hammer Editor | Valve |
| .XWV | Valve | Arquivos de áudio | Valve Xbox360 Audio Data | Valve Source SDK | Valve |
| .ZTMP | Valve | Arquivos de jogos | Steam Compressed Game Resource File | Valve Steam HLDS Update Tool | Valve |
de 1 
