| Extension | 描述 | 檔案格式 |
|---|
| h | C/C++ Header File | Developer Files |
| h264 | H.264 video file | 視頻檔案 |
| h2w | H2testw File | 執行檔 |
| hdp | HD Photo File | 圖檔 |
| hdr | High Dynamic Range Image File | 圖檔 |
| hdr | InstallShield Setup Header | Misc Files |
| hds | Windows Digital Right Management File | 加密檔案 |
| hds | Hierarchical Dataset File | Geographical Files |
| hex | Hexadecimal Source File | Misc Files |
| hfs | Macintosh Disc Image File | 磁碟映像檔 |
| hlp | Microsoft Help File | 系統檔案 |
| hmt | HighMat File | 磁碟映像檔 |
| hpp | C++ Header File | Developer Files |
| hqx | Macintosh BinHex Encoded File | Encoded Files |
| hst | Yahoo Messenger History File | Misc Files |
| hta | HTML Application | 執行檔 |
| htaccess | Access Configuration File | 設定檔 |
| htc | HTML Component File | 網頁檔案 |
| htm | Hypertext Markup File | 網頁檔案 |
| html | HTML 1.0 | 網頁檔案 |
| htt | Hypertext Template File | 設定檔 |
| hus | Husqvarna Embroidery Machines File | Misc Files |
| hwp | Hangul Document File | 文字檔 |