File Extensions beginning with the letter 'H'

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Extension currently sorted on Extension Description click to sort by Description Format MIME Type
H C program header
H C programming language header
h C header file
H++ C++ Header; "H++" extension not allowed in 16-bit DOS; see H__
H-- C Header
HA Archive
HAP Archive
HBF Font; Hanzi Bitmap Font 1.1
HBK Mathcad handbook
HCM IBM HCM configuration file
HCOM Sound Tools HCOM format
HCR IBM HCD/HCM production configuration file
HCX Chart; Harvard Chart XL
HDF Hierarchical Data Format for NCSA
HDF National Center for Supercomputing Applications (NCSA) geospatial Hierarchical Data Format file
HDF Hierarchical Data Format
HDP HD Photo. Microsoft-proprietary lossy raster image format for photography. Previously known as Windows Media Photo. [HDPhoto]
HDR (2) Text; Description of an EXE, using output from EXEHDR.EXE redirected to a file for Intel VTune.
HDR (1) Database; Egret; PC-File
HDS Hierarchical Data System
HDW Vector Drawing; Harvard Draw for Windows; SDSC Image Tools
HED HighEdit document
HED Document; High-Edit
HEL Microsoft Hellbender saved game
HEX Macintosh BinHex 2.0 file
HEX Program image with all references resolved, for EEPROM programming
HGL Hewlett-Packard Graphics Language; see PLT
HGL HP Graphics Language drawing
HH Map file. Contains topic IDs and map numbers for each of the topics in a Help system. Allows the running application to send the user the appropriate context-sensitive help topic
HH C++ Header; see H++
hhc BlueSky HyperHelp contents
HHC Microsoft HTML Help Contents; see HHK, CHM
HHH Power C pre-compiled header
hhk BlueSky HyperHelp keywords (index)
HHK Microsoft HTML Help Index; see HHC, CHM
HHP ProComm Plus Host Mode Help
HIN HyperChem
HJT Treepad PIM data file. There is also a Java clone JreePad.
HL$ Microsoft compressed HLP (DOS help file); decompress with UNPACK.EXE
HLP Help file - May be DOS, or 16- or 32-bit Windows
hlp MSWindows help file
HLP Help file
HLP DataCAD Windows Help file
hlp Program on-line Help File
HLP Help file
HLP Help file
HLX Helix, Nuts&Bolts utility
HM Windows Help context IDs used by MAKEHM.EXE
HOF Hall Of Fame
HOG Lucas Arts Dark Forces WAD file
HOT Mosaic Internet address
HP (2) C++ Header; same as HPP
HP (1) Picture; Hewlett-Packard Graphics Language (plotter)
HP8 Text; NewWave Write
HPG Hewlitt-Packard Graphics Language (printer image). Usually HPGL.
HPGL Hewlitt-Packard Graphics Language (printer image)
HPI Font Information; GEM
hpj MSWindows help project
HPJ Help project description for Windows help compiler
HPJ Visual Basic Help Project
HPM Text; Hewlett-Packard NewWave
hpp C++ header file
HPP C++ Header
HPP C++ program header
HPPCL Hewlett-Packard Printer Control Language
HPS Hewlett-Packard PrintSmart Document collection settings used with HTML Documents; see HPY, INI
HPW CompuServe Home Page Wizard (16-bit)
HPY Hewlett-Packard Web PrintSmart style sheet used with HPS
HQX Macintosh BinHex 4.0 file
hqx Binhex
HQX Archive; Macintosh compressed archive (use BinHex 4.0 to decompress) (MIME: application/mac-binhex40)
HRF Bitmap Picture; Hitachi
HRF Hitachi Raster Format
HRT Sound; Hornet Packer
HRZ Picture
HS2 Bitmap Picture; Postering Monochrome Picture
HSF HOOPS Stream File. details [HSF]
HSI Bitmap Picture; Image Alchemy; see JPG
HSM Include; Assembly language header (University of Waterloo Engineering convention); see INC
HST History file
HST History (uncommon?)
HT Hyper Terminal file
HT HyperTerminalTM file
HT Windows Hyper-Terminal
HT Hyper Terminal
HT HyperTerminal
HT3 HTML; Internet Document, Version 3 (uncommon)
HTC Help file contents for Microsoft Windows CE; see 2BP, HLP, HTP
HTF Document; Hyper-G Text Format
HTM HyperText Markup [HTML] text/html
HTML HyperText Markup Language [HTML] text/html
HTP Help Topic file for Microsoft Windows CE; see HLP, HTC
HTR HTML-like script
HTT Microsoft Hypertext Template
HTT Microsoft Internet Explorer Hyper-Text Template (MIME: text/webviewhtml)
htt HyperText Template
HTX Microsoft FrontPage Database results, HTML-like query script; see IDC
HTX Extended HTML template
htx MS IIS HTML template
HTX Document; Hypertext
HWD Presentation; Hollywood
HXM Descent2 HAM file extension
HXS Microsoft Help 2.0
HXX C++ Header
HYP (1) Archive; Hyper
HYP (2) Adobe Illustrator Hyphenation Dictionary
HYZ Corel WordPerfect hyphenation
HZ Document; ASCII and Chinese text
H__ C++ Header; Same as H++ in 16-bit DOS; see H++