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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .H1S | Microsoft Corporation | System Files | Windows Assistance Platform Help File | Microsoft Windows | Microsoft Corporation |
| .HAM | Interplay Entertainment | System Files | Descent 2 Resource File | Interplay Descent 2 | Interplay Entertainment |
| .HCD | Samsung Electronics | System Files | Samsung Android Firmware File | Google Android | |
| .HDMP | Microsoft Corporation | System Files | Windows Heap Dump | Microsoft Windows | Microsoft Corporation |
| .HELP | Apple | System Files | Mac OS X Help Book | macOS | Apple |
| .HHC | Microsoft Corporation | System Files | HTML Help Table Of Contents | Microsoft HTML Help Workshop | Microsoft Corporation |
| .HHK | Microsoft Corporation | System Files | HTML Help Index | Microsoft HTML Help Workshop | Microsoft Corporation |
| .HIV | Microsoft Corporation | System Files | Windows Registry Hive File | Microsoft Windows | Microsoft Corporation |
| .HLP | Microsoft Corporation | System Files | Windows Help File | Microsoft Windows | Microsoft Corporation |
| .HPJ | Microsoft Corporation | System Files | Help Project File | Adobe RoboHelp | Adobe Systems Incorporated |
| .HSH | Microsoft Corporation | System Files | Windows Catalog Search Index File | Microsoft Windows | Microsoft Corporation |
| .HTT | Microsoft Corporation | System Files | Hypertext Template File | Microsoft Windows | Microsoft Corporation |
| .HTW | Microsoft Corporation | System Files | IIS Webhits Template | Microsoft IIS | Microsoft Corporation |
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