| .HDP | Microsoft Corporation | Raster Image Files | HD Photo File | Adobe Photoshop | Adobe Systems Incorporated |
| .HDT | Adobe Systems Incorporated | Settings Files | Photoshop HDR Toning Preset File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .HELPCFG | Adobe Systems Incorporated | Settings Files | Adobe AIR Help Configuration | Adobe AIR | Adobe Systems Incorporated |
| .HLM | Adobe Systems Incorporated | Text Files | Winhelp Vbhilfe File | Adobe Authorware | Adobe Systems Incorporated |
| .HLP | Microsoft Corporation | System Files | Windows Help File | Adobe RoboHelp | Adobe Systems Incorporated |
| .HPJ | Microsoft Corporation | System Files | Help Project File | Adobe RoboHelp | Adobe Systems Incorporated |
| .HPR | Adobe Systems Incorporated | Settings Files | Internal RoboHelp File | Adobe RoboHelp | Adobe Systems Incorporated |
| .HSE | Adobe Systems Incorporated | Developer Files | Homesite Snippet End | Adobe Dreamweaver | Adobe Systems Incorporated |
| .HTA | Microsoft Corporation | Executable Files | HTML Application | Adobe Dreamweaver | Adobe Systems Incorporated |
| .HTACCESS | Apache Software Foundation | Web Files | Apache HTACCESS File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .HTML5 | Sublime HQ Pty Ltd | Developer Files | HTML5 Hypertext Markup Language Revision 5 Source Code | Adobe Dreamweaver | Adobe Systems Incorporated |
| .HTMLS | Open Source | Web Files | HTML With Server-Side Include | Adobe Dreamweaver | Adobe Systems Incorporated |
| .HYP | Interscape | Compressed Files | HYPER Compressed Archive | Adobe Illustrator CC | Adobe Systems Incorporated |
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