| Extension |
File Type |
File Description |
| .h | Developer | C++ or Java Header File |
| .h1q | Misc | Microsoft Help Merged Query Index File |
| .h3m | Game | Heroes 3 Map File |
| .h4r | Game | Heroes of Might and Magic IV Data File |
| .ha | Compressed | HA Compressed Archive |
| .hal | Developer | HansaWorld Application Language File |
| .ham | Game | Descent 2 Resource File |
| .has | Developer | Haskell Script |
| .hbc | Compressed | HyperBac Compressed Archive |
| .hbc2 | Compressed | HyperBac Compressed File Archive |
| .hbe | Compressed | HyperBac Compressed and Encrypted Archive |
| .hbx | Encoded | BinHex Encoded File |
| .hcc | Data | HydroCAD Prefab Chamber Data File |
| .hce | Data | HydroCAD Hydrograph Data File |
| .hci | Data | HydroCAD IDF Data File |
| .hcp | Data | HydroCAD Project File |
| .hcr | Data | HydroCAD Rainfall Curve Data File |
| .hcr | Page Layout | Half-Fold Card File |
| .hcu | Data | Hydrograph Units Definitons File |
| .hcx | Image | ChartXL Chart |
| .hd2 | 3D Image | Poser Hand Pose File |
| .hda | Data | HotDocs Auto-Assemble File |
| .hdb | Data | HansaWorld Database File |
| .hdd | Disk | Parallels Desktop Hard Disk File |
| .hdf | Data | Hierarchical Data Format File |
| .hdi | Data | HotDocs Auto-Install File |
| .hdl | Data | HotDocs Library |
| .hdm | Web | HDML File |
| .hdml | Web | Handheld Device Markup Language File |
| .hdmov | Video | QuickTime HD Movie File |
| .hdmp | System | Windows Heap Dump |
| .hdp | Raster Image | HD Photo File |
| .hdr | Raster Image | High Dynamic Range Image File |
| .hdz | 3D Image | Compressed Poser Hand Pose 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 |
| .hhsl | Game | Hockey High Score List File |
| .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 Definition 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 |
| .hkm | Video | Havok Movie File |
| .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 |
| .hma | Audio | Sony HI-MD Audio File |
| .hmk | Page Layout | Hallmark Card Studio File |
| .hml | Data | HostMonitor TestList File |
| .hms | Executable | HostMonitor Script File |
| .hmt | Data | HighMAT File |
| .hmx | Misc | Help & Manual 4 Project |
| .hog | Game | Descent Mission File |
| .hot | Game | The Sims Sound File |
| .hpf | Developer | High Performance Fortran File |
| .hpf | Executable | HP9100A Program File |
| .hpg | Vector Image | HPGL Plot File |
| .hpgl | Vector Image | HP Graphics Language Plotter File |
| .hpi | Raster Image | Hemera Photo Objects Image File |
| .hpj | System | Help Project 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 |
| .hr2 | 3D Image | Poser Hair File |
| .hrf | Image | Hitachi Raster Format |
| .hrz | 3D Image | Compressed Poser Hair File |
| .hs | Misc | Motorola Flash Flex File |
| .hs | Text | Java HelpSet File |
| .hs | Developer | Haskell Script |
| .hs2 | Data | HyperRESEARCH 2 Study File |
| .hsk | Data | Huskey Truss & Building Supply Import File |
| .hst | Data | History File |
| .hta | Executable | HTML Application |
| .htaccess | Web | Apache HTACCESS File |
| .htc | Text | HTML Component File |
| .htg | Data | HackTheGame Mission Pack |
| .htm | Web | Hypertext Markup Language File |
| .html | Web | Hypertext Markup Language File |
| .htt | System | Hypertext Template File |
| .htx | Web | HTML Extension File |
| .htz4 | Page Layout | HyperMaker Publication |
| .huh | Data | HydroCAD Unit Hydrograph Definitions File |
| .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 |
| .hyv | Data | Team Manager Meet Event File |
| .hz | Text | Chinese (Hanzi) Text |
