| D$$ | AGT Game Encrypted Message File | Game Files | 1 | 1 |
| D0 | Unknown File Type | Uncommon Files | 1 | 1 |
| D00 | VirtualDrive Disc Image Part File | Disk Image Files | 1 | 1 |
| D01 | OPL2 FM Audio File | Audio Files | 2 | 2 |
| D02 | MicroSim PCBoard NC Drill Data File | Data Files | 3 | 3 |
| D03 | Jydivide Split File | Compressed Files | 3 | 3 |
| D04 | MicroSim PCBoard NC Drill Data File |
Data Files
| 1 | 1 |
| D05 | MicroSim PCBoard NC Drill Data File |
Data Files
| 1 | 1 |
| D06 | MicroSim PCBoard NC Drill Data File |
Data Files
| 1 | 1 |
| D07 | MicroSim PCBoard NC Drill Data File |
Data Files
| 1 | 1 |
| D1 | Progress Database | Database Files | 2 | 1 |
| D10 | Drake Software Data File |
Data Files
| 1 | 1 |
| D11 | Macro Mania Data File |
Data Files
| 1 | 1 |
| D15 | HERE Maps For Android Map Data Package |
Uncommon Files
| 1 | 1 |
| D2 | Progress Database |
Database Files
| 2 | 1 |
| D2D | 3D Fassade Plus CAD Data | CAD Files | 1 | 1 |
| D2H | Diablo II Hack It Module |
Game Files
| 1 | 1 |
| D2I | ATMA Diablo II |
Game Files
| 1 | 1 |
| D2J | D2jsp Script File | Developer Files | 1 | 1 |
| D2R | Dazzle Dazzle Realization File |
Game Files
| 1 | 1 |
| D2S | Diablo 2 Save File |
Game Files
| 2 | 1 |
| D2V | DVD2AVI File | Video Files | 2 | 1 |
| D2X | Diablo 2 Stash Data |
Game Files
| 1 | 1 |
| D3D | Game Maker 3D File | 3D Image Files | 3 | 3 |
| D3P | DigitalPrintLab Data |
Data Files
| 1 | 1 |
| D3S | Nikon Image Format | Camera Raw Files | 1 | 1 |
| D4 | Dataphor Source File |
Developer Files
| 1 | 1 |
| D4C | Dataphor Data File |
Data Files
| 1 | 1 |
| D64 | Commodore 64 Disk Image |
Disk Image Files
| 5 | 1 |
| D67 | VICE Disk Image File |
Game Files
| 1 | 1 |
| D71 | Commodore Emulator Data |
Data Files
| 1 | 1 |
| D81 | Commodore VC-1581 Diskette Emulator Image |
Game Files
| 1 | 1 |
| D82 | Commodore Emulator File |
Uncommon Files
| 1 | 1 |
| D83 | GAEB 1990 Data |
Data Files
| 1 | 1 |
| DA | DAwin Project File |
Uncommon Files
| 2 | 1 |
| DA! | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| DA0 | Windows Registry Backup File | Backup Files | 1 | 1 |
| DA2 | Windows Dancer File |
Video Files
| 4 | 4 |
| DA5 | AGT Game Data File |
Game Files
| 1 | 1 |
| DA5032 | Unknown File Type |
Uncommon Files
| 1 | 1 |
| DA6 | AGT Game Data File |
Game Files
| 2 | 2 |
| DA7 | Star Trek Generations Saved Game File |
Game Files
| 1 | 1 |
| DAA | PowerISO Direct-Access-Archive |
Disk Image Files
| 6 | 1 |
| DAB | Digital Audio Broadcasting Audio Data |
Audio Files
| 5 | 4 |
| DAC | Dynacom Accounting Data |
Data Files
| 1 | 1 |
| DAE | Digital Asset Exchange File |
3D Image Files
| 8 | 1 |
| DAEMONSCRIPT | Daemon Tools Script |
Uncommon Files
| 1 | 1 |
| DAF | Digital Anchor File |
Data Files
| 1 | 1 |
| DAH | AutoPlay Media Studio Splash Image | Raster Image Files | 1 | 1 |
| DAI | Dream Aquarium Patch File |
Data Files
| 1 | 1 |
| DAL | DVD-lab Project File |
Data Files
| 2 | 2 |
| DAN | D-MAS Analysis System Patient Data File |
Data Files
| 1 | 1 |
| DANGER | Unknown File Type |
Uncommon Files
| 1 | 1 |
| DAO | Disk At Once CD/DVD Image |
Disk Image Files
| 3 | 1 |
| DAP | Download Accelerator Plus Partial Download |
Uncommon Files
| 3 | 3 |
| DAPROJ | DivX Author Project File |
Video Files
| 1 | 1 |
| DAR | DAR Disk Archive File |
Compressed Files
| 2 | 2 |
| DARBY | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| DART | Dart Source Code File |
Developer Files
| 2 | 2 |
| DAS | DeltaMaster Analysis Session |
Data Files
| 1 | 1 |
| DAT | Game Data |
Game Files
| 18 | 13 |
| DATA | Analysis Studio Offline Data |
Data Files
| 13 | 7 |
| DATAGRABBER | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| DATALESS | Unknown File Type |
Uncommon Files
| 1 | 1 |
| DATALINKHE | Unknown File Type |
Uncommon Files
| 1 | 1 |
| DATASOURCE | Microsoft Visual Studio Data Source |
Uncommon Files
| 1 | 1 |
| DATE | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| DAT_OLD | Minecraft Level.dat Backup File |
Game Files
| 1 | 1 |
| DAV | DVR365 Video File |
Video Files
| 1 | 1 |
| DAVE | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
Data Files
| 3 | 1 |
| DAVMOUNT | Windows Based Script Host | System Files | 1 | 1 |
| DAW | Hasbro Scrabble CDROM OWL2 List File |
Data Files
| 2 | 2 |
| DAX | PSP Compressed ISO Disc Image |
Disk Image Files
| 3 | 1 |
| DAY | Day Of The Zombie Map File |
Game Files
| 1 | 1 |
| DAYS | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
Data Files
| 3 | 1 |
| DAZ | DAZ Studio 3D Scene |
3D Image Files
| 2 | 2 |
| DA_ | GKSetup Support Data |
Data Files
| 1 | 1 |
| DB | Mobile Device Database File |
Database Files
| 29 | 19 |
| DB-JOURNAL | SQLite Rollback Journal File |
Database Files
| 8 | 1 |
| DB-MAIN | DB-MAIN Project File |
Data Files
| 1 | 1 |
| DB0 | dBASE Init File |
Data Files
| 2 | 2 |
| DB1 | Tekla Structures Model File |
CAD Files
| 1 | 1 |
| DB2 | Samsung CCTV Video Information File |
Video Files
| 2 | 2 |
| DB3 | SQLite Database File |
Database Files
| 5 | 1 |
| DB4 | dBASE IV Data |
Database Files
| 3 | 3 |
| DB5 | S.T.A.L.K.E.R. Game Data |
Game Files
| 1 | 1 |
| DB6 | S.T.A.L.K.E.R. Game File Format |
Game Files
| 2 | 1 |
| DBA | Turbo Prolog Database |
Database Files
| 12 | 8 |
| DBB | S.T.A.L.K.E.R. Game File |
Game Files
| 3 | 3 |
| DBC | FoxPro Database File |
Database Files
| 5 | 5 |
| DBD | DemoShield Project |
Data Files
| 2 | 2 |
| DBE | ActiveSync Backup File Format |
Backup Files
| 1 | 1 |
| DBF | Database File |
Database Files
| 30 | 19 |
| DBG | Visual FoxPro Debugger Configuration File | Settings Files | 1 | 1 |
| DBH | CodeWarrior Debug Preferences |
Settings Files
| 1 | 1 |
| DBI | FIFA World Cup Game Data Comin Fe |
Game Files
| 1 | 1 |
| DBK | Sony Ericsson Mobile Phone Backup File |
Backup Files
| 8 | 4 |
| DBL | Microsoft Windows XP Product Activation Data |
System Files
| 2 | 2 |
| DBM | ColdFusion Server File | Web Files | 7 | 2 |
| DBML | Visual Studio OR Design File |
Developer Files
| 2 | 1 |
of 7 
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