| Extension |
File Type |
File Description |
| .h | Developer | C++ or Java Header File |
| .ha | Compressed | HA Compressed Archive |
| .ham | Game | Descent 2 Resource File |
| .has | Developer | Haskell Script |
| .hcx | Image | ChartXL Chart |
| .hdf | Data | Hierarchical Data Format File |
| .hdl | Data | HotDocs Library |
| .hdml | Web | Handheld Markup Language |
| .hdmp | System | Windows Heap Dump |
| .hdp | Raster Image | HD Photo File |
| .hdr | Raster Image | High Dynamic Range Image File |
| .hex | Misc | Hexadecimal Source File |
| .hex | Encoded | BinHex Encoded File |
| .hf | Image | HF Image |
| .hgl | Misc | HP Graphics Language File |
| .hh | Developer | C++ Header File |
| .hhc | System | HTML Help Table of Contents |
| .hhh | Developer | Power C Precompiled Header File |
| .hhk | System | HTML Help Index |
| .hht | Text | Help and Support Center HHT File |
| .hid | Settings | Sony Ericsson Remote Settings File |
| .hif | Data | Quicken Online File |
| .hip | Image | Houdini Project File |
| .hipnc | Image | Houdini Apprentice File |
| .his | Misc | FindinSite Database File |
| .hit | Game | The Sims Sound File |
| .hki | Compressed | WinHKI Archive |
| .hki1 | Compressed | WinHKI HKI1 Archive |
| .hki2 | Compressed | WinHKI HKI2 Archive |
| .hki3 | Compressed | WinHKI HKI3 Archive |
| .hl | Data | HeuristicLab Storage File |
| .hlb | Misc | VMS / VAX Help Library |
| .hlp | System | Windows Help File |
| .hlx | Misc | ATI Radeon Video Driver Support File |
| .hm3 | Misc | Help & Manual 3 Project |
| .hmk | Page Layout | Hallmark Card Studio File |
| .hmx | Misc | Help & Manual 4 Project |
| .hog | Game | Descent Mission File |
| .hot | Game | The Sims Sound File |
| .hpgl | Vector Image | HP Graphics Language Plotter File |
| .hpi | Raster Image | Hemera Photo Objects Image File |
| .hpk | Compressed | HPack Compressed Archive |
| .hpl | Vector Image | HP-GL Plotter File |
| .hpp | Developer | C++Builder Header File |
| .hqx | Encoded | BinHex 4.0 Encoded File |
| .hr | Image | TRS-80 Graphic |
| .hrf | Image | Hitachi Raster Format |
| .hs | Developer | Haskell Script |
| .hs | Misc | Motorola Flash Flex File |
| .hta | Executable | HTML Application |
| .htaccess | Web | Apache HTACCESS File |
| .htm | Web | Hypertext Markup Language File |
| .html | Web | Hypertext Markup Language File |
| .htt | System | Hypertext Template File |
| .htx | Web | HTML Extension File |
| .htz4 | Web | HyperMaker Publication |
| .hus | Misc | Husqvarna Embroidery File |
| .hwp | Text | Hangul (Korean) Text Document |
| .hxm | Game | Descent 2 Resource Modification |
| .hxs | Web | Help 2 Compiled Help File |
| .hyp | Compressed | HYPER Compressed Archive |
| .hz | Text | Chinese (Hanzi) Text |
