File extension	The full name of the file	Popularity
File extension H	C/C++/Objective-C Header File
File extension H0	Magix Music Studio file
File extension H10	At Home Canada 2010 Tax Return
File extension H11	At Home Canada 2011 Tax Return
File extension H12	At Home Canada 2012 Tax Return
File extension H1Q	Microsoft Help Merged Query Index File
File extension H1S	Windows Assistance Platform Help File
File extension H264	H.264 Encoded Video File
File extension H2O	Battle Realms Game Data File
File extension H3M	Heroes 3 Map File
File extension H4R	Heroes of Might and Magic IV Data File
File extension HA	HA Compressed Archive
File extension HAL	HansaWorld Application Language File
File extension HAM	Descent 2 Resource File
File extension HAS	Haskell Script
File extension HBC	HyperBac Compressed Archive
File extension HBC2	HyperBac Compressed File Archive
File extension HBE	HyperBac Compressed and Encrypted Archive
File extension HBK	Mathcad Handbook File
File extension HBX	BinHex Encoded File
File extension HCC	HydroCAD Prefab Chamber Data File
File extension HCE	HydroCAD Hydrograph Data File
File extension HCF	Compact Ham Library
File extension HCI	HydroCAD IDF Data File
File extension HCL	HotDocs Clause Archive
File extension HCP	HydroCAD Project File
File extension HCR	HydroCAD Rainfall Curve Data File
File extension HCU	Hydrograph Units Definitons File
File extension HCX	ChartXL Chart
File extension HD2	Poser Hand Pose File
File extension HDA	HotDocs Auto-Assemble File
File extension HDB	HansaWorld Database File
File extension HDD	Parallels Desktop Hard Disk File
File extension HDF	Hierarchical Data Format File
File extension HDI	Hard Disk Image
File extension HDK	HotDocs Registration File
File extension HDL	HotDocs Library File
File extension HDM	HDML File
File extension HDML	Handheld Device Markup Language File
File extension HDMOV	QuickTime HD Movie File
File extension HDMP	Windows Heap Dump
File extension HDP	HD Photo File
File extension HDPMX	HotDocs Publisher Mapping XML File
File extension HDR	High Dynamic Range Image File
File extension HDRP	HDRtist graphic file
File extension HDS	Microsoft PlayReady Data File
File extension HDT	Photoshop HDR Toning Preset File
File extension HDUMX	HotDocs User Mapping XML File
File extension HDV	High Definition Video Format
File extension HDX	Delphi MultiHelp Index File
File extension HDZ	Compressed Poser Hand Pose File
File extension HEARTSSAVE-MS	Microsoft Hearts Save File
File extension HELP	Mac OS X Help Book
File extension HEX	Hexadecimal Source File
File extension HF	HF Image
File extension HFD	HotDocs Form Document
File extension HFS	HFS Disk Image File
File extension HFT	HotDocs Form Template
File extension HFV	HFS Disk Image
File extension HGL	HP Graphics Language File
File extension HGT	SRTM Elevation Data File
File extension HH	C++ Header File
File extension HHC	HTML Help Table of Contents
File extension HHH	Power C Precompiled Header File
File extension HHK	HTML Help Index
File extension HHSL	Hockey High Score List File
File extension HHT	Help and Support Center HHT File
File extension HI	MacMAME High Scores File
File extension HID	Sony Ericsson Remote Settings File
File extension HIF	Quicken Online File
File extension HIP	Houdini Project File
File extension HIPNC	Houdini Apprentice File
File extension HIS	FindinSite Database Definition File
File extension HIT	The Sims Sound File
File extension HIV	Windows Registry Hive File
File extension HJT	TreePad 6 Database File
File extension HKDB	Apple iTunes Library File
File extension HKI	WinHKI Archive
File extension HKI1	WinHKI HKI1 Archive
File extension HKI2	WinHKI HKI2 Archive
File extension HKI3	WinHKI HKI3 Archive
File extension HKM	Havok Movie File
File extension HL	HeuristicLab Storage File
File extension HLB	VMS / VAX Help Library
File extension HLP	Windows Help File
File extension HLSL	High Level Shader Language File
File extension HLX	ATI Radeon Video Driver Support File
File extension HM3	Help & Manual help file project
File extension HMA	Sony HI-MD Audio File
File extension HME	Smartphone theme file
File extension HMI	HMI Audio File
File extension HMK	Hallmark Card Studio File
File extension HML	HostMonitor TestList File
File extension HMP	Worms Height Map File
File extension HMS	HostMonitor Script File
File extension HMT	HighMAT File
File extension HMX	Help & Manual 4 Project
File extension HMXP	Help & Manual XML Project
File extension HMXZ	Help & Manual Compressed Project
File extension HOG	Descent Mission File
File extension HOL	Outlook Holidays File
File extension HONMOD	Heroes of Newerth mod file
File extension HOT	The Sims Sound File
File extension HPD	HotDocs PDF Document
File extension HPF	High Performance Fortran File
File extension HPG	HPGL Plot File
File extension HPGL	HP Graphics Language Plotter File
File extension HPI	Hemera Photo Objects Image File
File extension HPJ	Help Project File
File extension HPK	Tropico Game Archive
File extension HPL	HP-GL Plotter File
File extension HPP	C++ Header File
File extension HPS	HPL2 Script
File extension HPT	HotDocs PDF Template
File extension HQX	BinHex 4.0 Encoded File
File extension HR	TRS-80 Image
File extension HR2	Poser Hair File
File extension HRF	Hitachi Raster Format File
File extension HRL	Erlang Header File
File extension HRZ	Compressed Poser Hair File
File extension HS	Haskell Script
File extension HS2	HyperRESEARCH 2 Study File
File extension HSB	HALion Sound Bank File
File extension HSC	Aspen HYSYS Simulation File
File extension HSF	HOOPS Stream Format File
File extension HSH	Windows Catalog Search Index File
File extension HSK	Huskey Truss & Building Supply Import File
File extension HST	History File
File extension HT	HyperTerminal Session File
File extension HTA	HTML Application
File extension HTACCESS	Apache HTACCESS File
File extension HTB	Audacity Help File
File extension HTC	HTML Component File
File extension HTG	HackTheGame Mission Pack
File extension HTM	Hypertext Markup Language File
File extension HTML	Hypertext Markup Language File
File extension HTML0	Book Designer File
File extension HTMLZ	Zipped HTML eBook
File extension HTPASSWD	Apache HTACCESS File
File extension HTT	Hypertext Template File
File extension HTX	HTML Extension File
File extension HTXT	Hanvon eBook File
File extension HTZ4	HyperMaker 4 Publication
File extension HTZ5	HyperMaker 5 Publication
File extension HUH	HydroCAD Unit Hydrograph Definitions File
File extension HUS	Husqvarna Embroidery File
File extension HVC	ASCII file
File extension HVPL	iTunes Visual Plug-in File
File extension HWD	Hedgewars Demo File
File extension HWMAP	Hedgewars Drawn Map File
File extension HWP	Hanword Document
File extension HWS	Hedgewars Saved Game
File extension HXA	Microsoft Help 2 Attribute Definition File
File extension HXC	Microsoft Help 2 Collection Definition File
File extension HXE	Microsoft Help 2 Sample Definition File
File extension HXK	Microsoft Help 2 Index File
File extension HXM	Descent 2 Resource Modification
File extension HXN	Hexagon Model File
File extension HXS	Help 2 Compiled Help File
File extension HXT	Microsoft Help 2 Table of Contents File
File extension HXX	C++ Source Code Header File
File extension HYDRA	Hydra Image Filter Program File
File extension HYP	Dictionary Information File
File extension HYPE	Hype Document
File extension HYV	Team Manager Meet Event File
File extension HZ	Chinese (Hanzi) Text