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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .BLOB | Valve | Settings Files | Valve Steam Archive | Steam | 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 |
| .DMP | Microsoft Corporation | System Files | Windows Memory Dump File | Steam | Valve |
| .GCF | Valve | Game Files | Game Cache File | Steam | Valve |
| .LAST | Valve | Data Files | Valve Steam Data | Steam | Valve |
| .LAYOUT | Apple | Settings Files | Apple MainStage Layout Data | Steam | Valve |
| .MENU | id Software | Game Files | Quake 3 Engine Menu File | Steam | Valve |
| .MST | Corel | Settings Files | Corel Presentations Master Template File | Steam | Valve |
| .NCF | Valve | Game Files | No Cache File | Steam | Valve |
| .PKV | Valve | Compressed Files | Steam Package Data | Steam | Valve |
| .RES | Valve | Settings Files | Valve Resource File | Steam | 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 |
| .VDF | Valve | Game Files | Valve Data File | Steam | Valve |
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