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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .HAML | Sublime HQ Pty Ltd | Developer Files | HTML Abstraction Markup Language File | Microsoft Notepad | Microsoft Corporation |
| .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 |
| .HDT | Adobe Systems Incorporated | Settings Files | Photoshop HDR Toning Preset File | Microsoft Notepad | Microsoft Corporation |
| .HH | Microsoft Corporation | Developer Files | C++ Header File | Microsoft Notepad | Microsoft Corporation |
| .HPF | IBM | Developer Files | High Performance Fortran File | Microsoft Notepad | Microsoft Corporation |
| .HPP | Microsoft Corporation | Developer Files | C++ Header File | Microsoft Notepad | Microsoft Corporation |
| .HPS | Frictional Games | Game Files | HPL Script | Microsoft Notepad | Microsoft Corporation |
| .HRL | Ericsson Computer Science Laboratory | Developer Files | Erlang Header File | Microsoft Notepad | Microsoft Corporation |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Microsoft Notepad | Microsoft Corporation |
| .HTACCESS | Apache Software Foundation | Web Files | Apache HTACCESS File | Microsoft Notepad | Microsoft Corporation |
| .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 |
| .HTML5 | Sublime HQ Pty Ltd | Developer Files | HTML5 Hypertext Markup Language Revision 5 Source Code | Microsoft Notepad | Microsoft Corporation |
| .HTX | Microsoft Corporation | Web Files | HTML Extension File | Microsoft Notepad | Microsoft Corporation |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Microsoft Notepad | Microsoft Corporation |
| .H__ | Microsoft Corporation | Developer Files | C++ Header File | Microsoft Notepad | Microsoft Corporation |
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