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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .DOX | Microsoft Corporation | Text Files | Visual Basic Binary UserDocument | Microsoft Visual Studio | Microsoft Corporation |
| .DP | Stefan Hagel | Text Files | Text Document | Microsoft Notepad | Microsoft Corporation |
| .DPO | DECAdry | Text Files | DECAdry Express Business Cards Business Card | DECAdry Express Business Cards | DECAdry |
| .DROPBOX | Dropbox, Inc. | Text Files | Dropbox Shared Folder Tracker | Dropbox | Dropbox, Inc. |
| .DRP | DÖRR EDV-Beratung | Text Files | DReport Document | DReport | DÖRR EDV-Beratung |
| .DSC | Kingsoft | Text Files | Kingsoft Design Science Equation File | Kingsoft Office | Kingsoft |
| .DSO | Microsoft Corporation | Text Files | Microsoft Visual Studio Workspace Data | Microsoft Visual Studio | Microsoft Corporation |
| .DVI | The Evince Team | Text Files | Device Independent Format File | Evince | The Evince Team |
| .DWD | DiamondWare Ltd. | Text Files | DiamondWare Digital Audio File | Wi-Fone | DiamondWare Ltd. |
| .DX | Digital Equipment Corporation | Text Files | DEC WPS Plus File | Microsoft Notepad | Microsoft Corporation |
| .DXB | Autodesk, Inc. | Text Files | Drawing Exchange Binary | Autodesk AutoCAD | Autodesk, Inc. |
| .EDN | Xilinx, Inc. | Text Files | EDIF Implementation Netlist File | Xilinx ISE WebPACK | Xilinx, Inc. |
| .EDOC | EUSO | Text Files | Electronically Certified Document | EDOC Java Libraries | EUSO |
| .EGT | EagleGet | Text Files | EagleGet Temporary File | EagleGet | EagleGet |
| .EIM | EIAS3D | Text Files | Electric Image Model | Electric Image Animation System (EIAS) | EIAS3D |
| .EIO | Yozosoft | Text Files | Yozo Office File | Yozosoft Yozo Office | Yozosoft |
| .EIT | Yozosoft | Text Files | Yozo Office Template File | Yozosoft Yozo Office | Yozosoft |
| .EMD | FMJ-Software | Text Files | ABT Extended Module File | Awave Studio | FMJ-Software |
| .EMF | Microsoft Corporation | Text Files | Enhanced Windows Metafile | Apache OpenOffice | Apache Software Foundation |
| .EMLX | Apple | Text Files | Apple Mail Message | Notepad++ | Don Ho |
| .EN | Sublime HQ Pty Ltd | Text Files | English Language Translation File | Notepad++ | Don Ho |
| .EPP | Talasoft | Text Files | TalaPhoto Project | TalaPhoto | Talasoft |
| .ERR | Microsoft Corporation | Text Files | Error Log File | Microsoft Notepad | Microsoft Corporation |
| .ES | Interscape | Text Files | ECHOSPEECH File | ECHOSPEECH | Interscape |
| .ES3 | Microsec Software Engineering & Consulting Plc. | Text Files | E-Szigno Signed Document | e-Szigno | Microsec Software Engineering & Consulting Plc. |
| .ESD | Microsoft Corporation | Text Files | Windows Electronic Software Download File | Microsoft Windows | Microsoft Corporation |
| .ESS | Bethesda Softworks | Text Files | The Elder Scrolls Saved Game | Skyrim VR | Bethesda Softworks |
| .ETF | NetScape | Text Files | Enriched Text Format E-mail Message | GNU Emacs | GNU Project |
| .ETS | Enthuware | Text Files | Enthuware Test Studio Document | Enthuware Test Studio | Enthuware |
| .ETX | Open Source | Text Files | TeX Font Encoding File | MiKTeX | Christian Schenk |
| .EUC | Unknown Developer | Text Files | Extended Unix Code File | EUC-JP decoder | Unknown Developer |
| .EXC | Lionhead Studios | Text Files | Black & White Zone File | Lionhead Studios Black and White | Lionhead Studios |
| .EZ | Open Source | Text Files | EZ Word Document | Andrew User Interface System | Open Source |
| .EZM | E-Press Corporation | Text Files | Text File Mail Data | EasyOffice | E-Press Corporation |
| .FAD | Microsoft Corporation | Text Files | Office File Attribute Database File | Microsoft Office | Microsoft Corporation |
| .FBL | International TechneGroup Incorporated | Text Files | CADfix Command Level Log File | CADfix | International TechneGroup Incorporated |
| .FCF | Final Draft | Text Files | Final Draft Converter File | Final Draft | Final Draft |
| .FCT | Salty Brine | Text Files | FolderClone Task List | Salty Brine FolderClone | Salty Brine |
| .FD | Data Access Worldwide | Text Files | DataFlex Data File | DataFlex | Data Access Worldwide |
| .FDF | Adobe Systems Incorporated | Text Files | Acrobat Forms Data Format | Adobe Acrobat DC | Adobe Systems Incorporated |
| .FDR | Final Draft | Text Files | Final Draft Document | Final Draft | Final Draft |
| .FDS | Adobe Systems Incorporated | Text Files | JetForm FormFlow Data File | JetForm FormFlow | Adobe Systems Incorporated |
| .FDT | Final Draft | Text Files | Final Draft 5-7 Template | Final Draft | Final Draft |
| .FDW | Nelfo | Text Files | FEBDOK Document File | FEBDOK | Nelfo |
| .FDX | Final Draft | Text Files | Final Draft Document | Final Draft | Final Draft |
| .FEE | Kalahari Software LLC | Text Files | Precision Fees Fee Schedule | Precision Fees | Kalahari Software LLC |
| .FFP | Open Source | Text Files | FLAC Fingerprint Data | Notepad++ | Don Ho |
| .FFT | Adobe Systems Incorporated | Text Files | Adobe Audition Noise Print File | Adobe Audition | Adobe Systems Incorporated |
| .FGS | Chen Lujie | Text Files | Fig Figure Settings File | Fig | Chen Lujie |
| .FIN | Interscape | Text Files | Sapir Torah Text | Sapir Torah | Interscape |
| .FIRE | CoffeeCup | Text Files | FireStarter Project File | CoffeeCup FireStarter | CoffeeCup |
| .FLR | Igor Kogan | Text Files | Flare Decompiled ActionScript File | Microsoft Notepad | Microsoft Corporation |
| .FORM | Oracle Corporation | Text Files | NetBeans Java GUI Designer Form | NetBeans | Open Source |
| .FPC | Microsoft Corporation | Text Files | FoxPro Catalog Memo | Microsoft Visual FoxPro | Microsoft Corporation |
| .FR | Sublime HQ Pty Ltd | Text Files | French Language Translation | Notepad++ | Don Ho |
| .FRT | Microsoft Corporation | Text Files | FoxPro Report Memo | Microsoft Visual FoxPro | Microsoft Corporation |
| .FSC | ProFantasy Software Ltd | Text Files | Campaign Cartographer File | Campaign Cartographer 3 | ProFantasy Software Ltd |
| .FSS | Basta Computing | Text Files | Splitty Data Split File | Basta Computing Splitty | Basta Computing |
| .FULL | Red Hat | Text Files | Cygwin Variable Log | Cygwin | Open Source |
| .FWD | Ipswitch, Inc. | Text Files | IMail Server Forwarded Mail Message | Ipswitch IMail Server | Ipswitch, Inc. |
| .FX | Microsoft Corporation | Text Files | Direct3D Effects File | Microsoft Visual Studio | Microsoft Corporation |
| .FX2 | Corel | Text Files | Corel WordPerfect Office Template File | Corel WordPerfect | Corel |
| .GBF | Yuku | Text Files | General Bible Format | Quick Bible | Yuku |
| .GDC | Iconics, Inc. | Text Files | Iconics GraphWorx32 Document | GraphWorX32 | Iconics, Inc. |
| .GER | Open Source | Text Files | German Text/html Info | Notepad++ | Don Ho |
| .GGG | Sharon Dugdale and David Kibbey | Text Files | Green Globs & Graphing Equations Records | Green Globs & Graphing Equations | Sharon Dugdale and David Kibbey |
| .GMD | YoYo Games | Text Files | Game Maker Program Code | GameMaker Studio | YoYo Games |
| .GMP | Blue Marble Geographics | Text Files | Global Mapper Package File | Global Mapper | Blue Marble Geographics |
| .GMX | YoYo Games | Text Files | GameMaker File | GameMaker Studio | YoYo Games |
| .GNU | Sublime HQ Pty Ltd | Text Files | GNU Licence Information | Sublime Text | Sublime HQ Pty Ltd |
| .GPD | Microsoft Corporation | Text Files | Generic Printer Description File | Microsoft Windows | Microsoft Corporation |
| .GPL | Open Source | Text Files | GNU Public License Text File | Microsoft Notepad | Microsoft Corporation |
| .GPN | Matt Herron | Text Files | GlidePlan Map Document | GlidePlan | Matt Herron |
| .GSD | PROFIBUS & PROFINET International | Text Files | General Station Description File | Microsoft Notepad | Microsoft Corporation |
| .GUIDE | Unknown Developer | Text Files | AmigaGuide Hypertext Document | Amiga Forever | Cloanto Corporation |
| .GUL | Samsung Electronics | Text Files | JungUm Global Document | JungUm Global | Samsung Electronics |
| .GV | AT&T Labs | Text Files | Graphviz DOT File | Graphviz | AT&T Labs |
| .GWB | Open Source | Text Files | Interwrite Presentation File | InterWrite Reader | Open Source |
| .GX | Saltire Software | Text Files | Geometry Expressions Document | Geometry Expressions | Saltire Software |
| .HBK | Mathsoft | Text Files | Mathcad Handbook File | Mathcad | PTC |
| .HCR | Broderbund | Text Files | Half-Fold Card File | CreataCard | American Greetings |
| .HDT | Adobe Systems Incorporated | Text Files | Photoshop HDR Toning Preset File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .HLM | Adobe Systems Incorporated | Text Files | Winhelp Vbhilfe File | Adobe Authorware | Adobe Systems Incorporated |
| .HLX | Advanced Micro Devices, Inc. | Text Files | ATI Radeon Video Driver Support File | ATI Catalyst | Advanced Micro Devices, Inc. |
| .HM2 | EC Software | Text Files | Help And Manual 2 Project | Help & Manual | EC Software |
| .HMW | Tandy | Text Files | Homeword For DeskMate Document | Homeword for DeskMate | Tandy |
| .HNC | Interscape | Text Files | NoteCenter Note | NoteCenter | Interscape |
| .HOT | Electronic Arts | Text Files | The Sims Audio File | Electronic Arts SimCity 4 | Electronic Arts |
| .HPW | Hewlett-Packard | Text Files | Hewlett-Packard Word Document File | Corel WordPerfect | Corel |
| .HRX | Herolab | Text Files | Herolab E.A.S.Y Document | Herolab E.A.S.Y | Herolab |
| .HS | Open Source | Text Files | Haskell Script | MacroMates TextMate | MacroMates |
| .HTD | ResearchWare Inc. | Text Files | HyperTRANSCRIBE Document | HyperTRANSCRIBE | ResearchWare Inc. |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Microsoft Notepad | Microsoft Corporation |
| .HWP | Hancom, Inc. | Text Files | Hanword Document | NeoOffice | Planamesa Software Inc. |
| .HWT | Huawei | Text Files | Huawei Emotion UI Theme | EMUI | Huawei |
| .HZ | Unknown Developer | Text Files | Chinese (Hanzi) Text | Unknown Software | Unknown Developer |
| .IGV | Broad Institute | Text Files | Integrative Genomics Viewer Data | Integrative Genomics Viewer | Broad Institute |
| .ILL | Unknown Developer | Text Files | Illust Logic Puzzle File | Unknown Software | Unknown Developer |
| .IRB | Yukihiro “Matz” Matsumoto | Text Files | Interactive Ruby Script | Ruby | Yukihiro “Matz” Matsumoto |
| .ISR | Open Source | Text Files | GoMoku Game File | Gomoku | Open Source |
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