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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .H | The Eclipse Foundation | Developer Files | C/C++/Objective-C Header File | Apple Xcode | Apple |
| .H264 | Ulead Systems | Video Files | H.264 Encoded Video File | Apple iTunes | Apple |
| .HAML | Sublime HQ Pty Ltd | Developer Files | HTML Abstraction Markup Language File | Apple TextEdit | Apple |
| .HARP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HCO | Apple | Audio Files | Macintosh Sound Resource Fork File | macOS | Apple |
| .HDM | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Apple Pages | Apple |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Apple Pages | Apple |
| .HDMOV | Apple | Video Files | QuickTime HD Movie File | Apple QuickTime Player | Apple |
| .HDT | Adobe Systems Incorporated | Settings Files | Photoshop HDR Toning Preset File | Apple TextEdit | Apple |
| .HEAD | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEADER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEIC | Moving Picture Experts Group | Raster Image Files | High Efficiency Image Format | Apple iOS | Apple |
| .HEIF | Moving Picture Experts Group | Raster Image Files | High Efficiency Image Format | Apple iOS | Apple |
| .HELP | Apple | System Files | Mac OS X Help Book | macOS | Apple |
| .HELPER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEY | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HH | Microsoft Corporation | Developer Files | C++ Header File | Apple Xcode | Apple |
| .HIGH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HINT | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .HOLLY | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .HPP | Microsoft Corporation | Developer Files | C++ Header File | Apple Xcode | Apple |
| .HPRT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HRL | Ericsson Computer Science Laboratory | Developer Files | Erlang Header File | Apple TextEdit | Apple |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Apple TextEdit | Apple |
| .HT | Hilgraeve Inc | Settings Files | HyperTerminal Session File | Apple Safari | Apple |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Apple Safari | Apple |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Apple Safari | Apple |
| .HTML5 | Sublime HQ Pty Ltd | Developer Files | HTML5 Hypertext Markup Language Revision 5 Source Code | Apple TextEdit | Apple |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Apple TextEdit | Apple |
| .H__ | Microsoft Corporation | Developer Files | C++ Header File | Apple Xcode | Apple |
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