| .ain |
Source Engine Compiled AI Nodegraph File |
| .acf |
Steam Application Cache File |
| .bsp |
Valve Game 3D Map File |
| .bmz |
Portal Bonus Map Zip File |
| .bns |
Portal Bonus Map Script |
| .csd |
Steam Game Data Backup File |
| .csm |
Character Studio Marker File |
| .ctx |
Visual Basic Control Binary File |
| .dem |
Video Game Demo File |
| .dmx |
Source Filmmaker Project File |
| .fgd |
Forge Game Data File |
| .gcf |
Game Cache File |
| .mdl |
MathWorks Simulink Model |
| .manifest |
Windows Application Manifest File |
| .ncf |
No Cache File |
| .nav |
Id Tech 3 Bot Navigation File |
| .ol |
Valve Hammer Object Layout File |
| .pwf |
Counter-Strike PODBot Waypoint File |
| .pxp |
Counter-Strike PODBot Experience File |
| .pcf |
PaintCAD Font |
| .pop |
Team Fortress 2 Population File |
| .p2c |
Portal 2 Community Puzzle File |
| .qc |
Half-Life Model Compiler Script |
| .res |
Valve Resource File |