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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .H | The Eclipse Foundation | Settings Files | C/C++/Objective-C Header File | MacroMates TextMate | MacroMates |
| .HCM | IBM | Settings Files | IBM HCM Configuration File | z/OS and z/VM Hardware Configuration Manager (HCM) | IBM |
| .HDP | Microsoft Corporation | Settings 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 |
| .HEP | Novell, Inc. | Settings Files | Help Librarian Data | NetWare | Novell, Inc. |
| .HFP | The Plugin Site | Settings Files | Harrys Filters Preset | Harry's Filters | The Plugin Site |
| .HID | Sony | Settings Files | Sony Ericsson Remote Settings File | Sony Ericsson PC Suite | Sony Mobile Communications |
| .HLX | Advanced Micro Devices, Inc. | Settings Files | ATI Radeon Video Driver Support File | ATI Catalyst | Advanced Micro Devices, Inc. |
| .HME | Microsoft Corporation | Settings Files | Windows Mobile Theme File | Microsoft ActiveSync | Microsoft Corporation |
| .HNF | Frans Nijhuis (Zekitez Freeware) | Settings Files | HNF Split & Merge Channels File | HNF Split & Merge | Frans Nijhuis (Zekitez Freeware) |
| .HNS | Han Kleijn | Settings Files | HNS Settings File | Hallo Night Sky | Han Kleijn |
| .HOW2 | Visma | Settings Files | Visma Performit Player Configuration File | Visma Performit Player | Visma |
| .HPR | Adobe Systems Incorporated | Settings Files | Internal RoboHelp File | Adobe RoboHelp | Adobe Systems Incorporated |
| .HRV | Commodore International | Settings Files | Personal Paint Croatian Language User Interface File | Personal Paint | Amiga |
| .HT | Hilgraeve Inc | Settings Files | HyperTerminal Session File | HyperTerminal | Hilgraeve Inc |
| .HTS | Open Source | Settings Files | HyperTuner Skin | HyperTuner | Open Source |
| .HWT | Huawei | Settings Files | Huawei Emotion UI Theme | EMUI | Huawei |
| .HXA | Microsoft Corporation | Settings Files | Microsoft Help Attribute Definition | Microsoft Visual Studio | Microsoft Corporation |
| .HXW | Microsoft Corporation | Settings Files | Microsoft Help Attribute Definition | Microsoft Visual Studio | Microsoft Corporation |
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