| cwd | Cardwar Cards deck |
| cwg | Castle of the Winds Data |
| cyr | Crysis Game Data |
| d1bank | MechAssault Audio Data |
| d2p | Diablo 2 Packet Data |
| d2s | Diablo 2 Saved Game |
| d2u | Deus Ex: Invisible War Data |
| d2x | Diablo 2 Player Stash Data |
| d3c | Descent 3 Data |
| d3dbsp | Call of Duty Map Data |
| d3f | MechCommander 2 Encyclopedia File |
| d3l | Descent 3 Level Data |
| d3m | Descent 3 Data |
| d3s | DRIV3R D3S Data |
| da5 | AGT Game Data |
| da6 | AGT Game Data |
| dac | Chips Challenge DAC File |
| dag | World Championship Poker 2 Game Data |
| dat_mcr | Minecraft Level Data Backup |
| dat_old | Minecraft Old Level Data Backup |
| dawg | Eliot Dictionary Data |
| day | Day of the Zombie Map |
| dazip | Dragon Age: Origins Game Data |
| db0 | Stalker Game Data |
| db1 | Stalker Game Data |
| db2 | Stalker Game Data |
| dcg | Pro Pinball: Fantastic Journey Data |
| dd2 | Dungeon Designer 2 Map Design |
| dd3 | Blood Bowl Game Data |
| ddj | SilkRoad Online Image |
| ddo | Tank3D Game Data |
| ddsx | Stronghold Kingdoms Game Data |
| ddt | Football Manager Data |
| ddv | Oddworld: Abes Oddysee Data |
| dek | LackeyCCG Deck File |