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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ABD | Interscape | Data Files | Adventure Builder Data | Adventure Builder | Interscape |
| .AC | GNU Operating System | Executable Files | Autoconf Script | X-Plane | Interscape |
| .ACF | Valve | Game Files | Steam Application Cache File | X-Plane | Interscape |
| .ADZ | GNU Project | Disk Image Files | Compressed Amiga Disk File | WinUAE | Interscape |
| .AJP | Interscape | Video Files | CCTV Video File | AJP Player | Interscape |
| .AKM | Srinivas Annam | Data Files | Aksharamala Keymap Binary Data | Aksharamala | Interscape |
| .AKS | Srinivas Annam | Text Files | Aksharamala Keymap Source | Aksharamala | Interscape |
| .AKT | Srinivas Annam | Text Files | Aksharamala Keymap Source | Aksharamala | Interscape |
| .AMC | Pegasys | Video Files | AMC Video File | Ant Movie Catalog | Interscape |
| .AMV | VideoLAN | Video Files | Anime Music Video File | Callum Hollywood AMV Studio | Interscape |
| .ANIM | Autodesk, Inc. | 3D Image Files | Maya Animation File | ifanimplay | Interscape |
| .ANM | Unknown Developer | 3D Image Files | 3D Animation File | Infinity | Interscape |
| .ARC | Symantec Corporation | Backup Files | Norton Backup Archive | NbuExplorer | Interscape |
| .ARR | Lemkesoft | Raster Image Files | Amber Graphic File | Multimedia Fusion | Interscape |
| .ASI | Borland | Plugin Files | ASsembler Include | Asi Loader | Interscape |
| .ASS | Ubisoft | Game Files | Splinter Cell Blacklist Game Data File | J2 Interactive MX Player | Interscape |
| .AUD | Interscape | Audio Files | Video Game Compressed Audio File | Command and Conquer | Interscape |
| .AUX | Interscape | Settings Files | LaTeX Auxiliary File | LaTeX Editor | Interscape |
| .AVM | VideoLAN | Video Files | Anime Music Video File | Callum Hollywood AMV Studio | Interscape |
| .BACK | Interscape | Data Files | RMCProfile Coefficient | RMCProfile | Interscape |
| .BIX | Take-Two Interactive | Game Files | Civilization 3 Scenario File | Techjunkies i3 DVR | Interscape |
| .BKG | Samsung Electronics | Data Files | Samsung Document | UWXAFS Project | Interscape |
| .BLB | SourceForge | Game Files | Interactive Fiction Package Game File | Zoom | Interscape |
| .BLS | Interscape | Game Files | Blockland Saved Game File | BlockLand | Interscape |
| .BNK | Unknown Developer | Audio Files | Adlib Instrument Bank | TDU Modding Tools | Interscape |
| .BOX | Unknown Developer | Data Files | E-mail Mailbox | Techjunkies i3 DVR | Interscape |
| .BVF | Interscape | Audio Files | iRock Digital Voice Recorder Audio Data | irock! 100 Series Voice & Audio Manager | Interscape |
| .BZW | Interscape | Game Files | BZFlag World File | BZFlag | Interscape |
| .CBR | Unknown Developer | Compressed Files | Comic Book RAR Archive | Comical | Interscape |
| .CBZ | Open Source | 3D Image Files | Comic Book Zip Archive File | Comical | Interscape |
| .CCA | IBM | Data Files | Cc:Mail Archive File | Multimedia Fusion | Interscape |
| .CCN | Clickteam | Developer Files | Compressed Multimedia Fusion File | Multimedia Fusion | Interscape |
| .CCX | Clickteam | Plugin Files | Click & Create Extension | Multimedia Fusion | Interscape |
| .CHART | Interscape | Text Files | Feedback Chart File | Feedback Chart Editor | Interscape |
| .CHK | Sophos | Data Files | InterCheck Checksum Database | DIY DataRecovery CHK-Mate | Interscape |
| .CHP | Corel Corporation | Data Files | Ventura Publisher Chapter Document | CodeHealer | Interscape |
| .CIA | Nintendo | Game Files | CTR Importable Archive | Ctrtool | Interscape |
| .CIE | OxyTech | Data Files | CIE File Format File-Color Information | Remote Director | Interscape |
| .CLASS | Oracle Corporation | Developer Files | Java Class File | DirtyJOE | Interscape |
| .CPGZ | Open Source | Compressed Files | Compressed UNIX CPIO Archive | ditto | Interscape |
| .CPIO | Power Software Ltd | Encoded Files | Unix CPIO Archive | ditto | Interscape |
| .CPS | Interscape | Game Files | The Powder Toy Save File | The Powder Toy | Interscape |
| .CSL | Interscape | Data Files | CineStyle Color Lookup File | CineStyle Color Assist | Interscape |
| .CSV | Unknown Developer | Data Files | Comma Separated Values File | GenScriber | Interscape |
| .CTF | Interscape | Data Files | WhereIsIt Catalog File | WhereIsIt | Interscape |
| .CTM | LucasArts Entertainment Company, LLC | Game Files | Star Wars Republic Commando Map File | WhereIsIt | Interscape |
| .CVS | Unknown Developer | Data Files | Comma Separated Values File | GenScriber | Interscape |
| .D02 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | Jydivide | Interscape |
| .D03 | Interscape | Compressed Files | Jydivide Split File | Jydivide | Interscape |
| .D2V | Interscape | Video Files | DVD2AVI File | DVD2AVI | Interscape |
| .DAP | SpeedBit | Uncommon Files | Download Accelerator Plus Partial Download | Diet Analysis Plus | Interscape |
| .DBF | dBase, LLC | Database Files | Database File | Arago | Interscape |
| .DCA | IBM | Text Files | DisplayWrite Document | Advanced Computer Innovations WordPort | Interscape |
| .DCD | IMSI/Design, LLC | CAD Files | DesignCAD Drawing | DisCryptor | Interscape |
| .DDOC | Interscape | Encoded Files | DigiDoc Signature File | qDigiDoc | Interscape |
| .DDT | Sports Interactive | Game Files | Football Manager Keep Player Data File | Diagram Designer | Interscape |
| .DDW | Dream Design Entertainment Software | Data Files | GLBasic World File | CSPro | Interscape |
| .DE | Interscape | Page Layout Files | DrawExpress Diagram File | DrawExpress | Interscape |
| .DED | Roland Corporation | Vector Image Files | Dr. Engrave Document | Dr. Engrave | Interscape |
| .DEK | Wizards of the Coast | Game Files | Magic: The Gathering Deck File | Magic | Interscape |
| .DFB | Interscape | Developer Files | Data Flask Formula | Interscape Data Flask | Interscape |
| .DFF | Zanoza Software | 3D Image Files | RenderWare Model File | RW Analyze | Interscape |
| .DFG | Interscape | Spreadsheet Files | Data Flask Grid File | Interscape Data Flask | Interscape |
| .DFP | Blackmagic Design | Plugin Files | Fusion Plugin File | Interscape Data Flask | Interscape |
| .DGT | Interscape | Data Files | Digital Gallery File | Digital Gallery | Interscape |
| .DHT | APTECH | Data Files | GAUSS Data Set Header File | Aptech GAUSS | Interscape |
| .DIM | Active@ Data Recovery Software | Backup Files | Active@ Raw Disk Image Backup File | DIME Parser | Interscape |
| .DIME | Interscape | Encoded Files | Direct Internet Message Encapsulation File | DIME Parser | Interscape |
| .DKD | Interscape | Audio Files | Karaoke Music File | JBK Karaoke Player | Interscape |
| .DLC | JDownloader Team | Encoded Files | Download Link Container File | PyLoad | Interscape |
| .DLI | Interscape | Data Files | Win32.Sober.AD@mm File | Win32.Sober.AD@mm | Interscape |
| .DM2 | Interscape | Data Files | Toad Data Modeler 2 File | Toad Data Modeler | Interscape |
| .DMT | DeLorme | GIS Files | XMap Transfer File | Topo North America | Interscape |
| .DMU | Interscape | Database Files | Musicnizer Database File | Musicnizer | Interscape |
| .DPE | Procedimientos-Uno, S.L. | Data Files | DPwinEHE Project File | DPwinEHE | Interscape |
| .DSK | Power Software Ltd | Disk Image Files | General Disk Image | Simple IDs | Interscape |
| .DTR | Swisslog | Data Files | Swisslog Downtime Analyzer Report | DTREG | Interscape |
| .DTV | Interscape | Video Files | DVD2AVI Mpeg2 File | DVD2AVI | Interscape |
| .DUB | Interscape | Audio Files | Tuningwrench Audio Utility Compressed Audio | Tuningwrench | Interscape |
| .DVI | The Evince Team | Text Files | Device Independent Format File | Skim | Interscape |
| .DWG | Autodesk, Inc. | CAD Files | AutoCAD Drawing Database File | BravoDRAFT | Interscape |
| .E01 | GetData | Disk Image Files | EnCase Image File | Libewf | Interscape |
| .EBF | Microsoft Corporation | Data Files | Pocket PC WindowsCE Form | EARS | Interscape |
| .ECM | Rbcafe | Disk Image Files | ECM Disc Image | Gemc | Interscape |
| .EEZ | Mascom | Encrypted Files | Encrypted Infected File | TorrentLocker | Interscape |
| .ENC | Smith Micro Software | Encoded Files | Encoded Data File | TorrentLocker | Interscape |
| .ENV | Adobe Systems Incorporated | Data Files | Adobe Dictionary Data File | X-Plane | Interscape |
| .EPA | Award Software Inc. | Raster Image Files | Award BIOS Logo Image Format | ePhotoAlbum | Interscape |
| .EPD | Interscape | Database Files | ChessDB Extended Position Description | ChessDB | Interscape |
| .ERF | BioWare | Game Files | BioWare Entity Resource File | ERF/RIM Editor | Interscape |
| .ES | Interscape | Audio Files | ECHOSPEECH File | ECHOSPEECH | Interscape |
| .EWT | Interscape | GIS Files | EWView Trace Data | EWView for MS-DOS | Interscape |
| .FBS | Interscape | Data Files | Fastbid Plan Sheet | Fastbid | Interscape |
| .FCB | Interscape | Data Files | FAAST Builder Data | FAAST Builder | Interscape |
| .FCS | Interscape | Data Files | Flow Cytometry Standard File | Verity Software House V-Comp | Interscape |
| .FD | Data Access Worldwide | Data Files | DataFlex Data File | LaTeX Editor | Interscape |
| .FDA | Relic Entertainment | Audio Files | Dawn Of War Audio File | FF&EZ | Interscape |
| .FDD | Parallels | Disk Image Files | Parallels Desktop Floppy Disk Image File | FormDocs | Interscape |
| .FDI | Open Source | Disk Image Files | Floppy Disk Image Files | WinUAE | Interscape |
| .FDK | Interscape | Data Files | Fluentizer Fluent Dictionary | Fluentizer | Interscape |
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