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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .HDM | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Microsoft Notepad | Microsoft Corporation |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Microsoft Notepad | Microsoft Corporation |
| .HT | Hilgraeve Inc | Web Files | HyperTerminal Session File | HyperTerminal | Hilgraeve Inc |
| .HT3 | Unknown Developer | Web Files | HTML File | Internet Explorer | Microsoft Corporation |
| .HTACCESS | Apache Software Foundation | Web Files | Apache HTACCESS File | Microsoft Notepad | Microsoft Corporation |
| .HTC | Microsoft Corporation | Web Files | HTML Component File | MacroMates TextMate | MacroMates |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Microsoft Notepad | Microsoft Corporation |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Microsoft Notepad | Microsoft Corporation |
| .HTMLS | Open Source | Web Files | HTML With Server-Side Include | Notepad++ | Don Ho |
| .HTX | Microsoft Corporation | Web Files | HTML Extension File | Microsoft Notepad | Microsoft Corporation |
| .HXS | Microsoft Corporation | Web Files | Help 2 Compiled Help File | Microsoft Visual Studio | Microsoft Corporation |
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