file extension Windows/OS2/Apple/Unix/Dos

File ExtensionsWindows/OS2/Apple/UNIX

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H = Header File normally with .C or .CPP file
H = Mime: text/plain
H = Mime: text/x-h
H! = Flambeaux Help
H! = Perfect Database help database
H++ = unusual C++ Header, normally .H
H-- = Sphinx C-- header file
H0 = Magix Musstu file
H08 = wisosparbuch2008file open with: "%ProgramFiles%\WISO\Sparbuch 2008\wiso2008.exe" "%1"
H09 = wisosparbuch2009file open with: "%Applications%\WisoSpar2009\wiso2009.exe" "%1"
H1 = Magix Musstu file
H16 = Msdev Vc98 Include file(16 bit)
H1C = h1cfile special configuration file for application(binary format)
H1D = h1dfile special configuration file for application(binary format)
H1F = h1ffile special configuration file for application(binary format)
H1H = h1hfile special configuration file for application(binary format)
H1K = h1kfile special configuration file for application(binary format)
H1Q = h1qfile special configuration file for application(binary format)
H1S = h1sfile special configuration file for application(binary format)
H1T = h1tfile special configuration file for application(binary format)
H1V = h1vfile special configuration file for application(binary format)
H1W = h1wfile special configuration file for application(binary format)
H32 = Bc45 32bit include file
H6C = Spp file
H_ = Winhelp file (compressed)
H__ = seldom used C++ Header same as H++ and H
HA = Compressed file archive (HA)
HAI = Ntgraph Nt09b-2b Emx Lib file
HAIRY = cygnus share file
HAL = Hyper Access Lite OS/2 data file
HAM = Novell NetWare disk drivers NPA
HAP = HAP Compressed file archive
HAT = Formula 1 car race 2001 Log Hat file
HAZ = Game: Ms flight Texture file
HBF = Hanzi Bitmap Font (HBF) File Format version 1.1
HBK = MathCAD Handbook
HBM = Hotline BookMark
HBX = Starmoney Macro file
HBY = ROM image resources
HBZ = Starmoney Macro file
HC = Header file
HCD = C Poet Examples Advanced Inc file
HCL = 3DS image
HCM = IBM HCM Configuration
HCO = Macintosh Sound + Resource Fork
HCOM = Sound (Macintosh)
HCR = IBM HCD/HCM Production Configuration
HCT = Symantec Liveupdate file
HCX = Harvard Chart XL chart
HDA = HotDocs Document
HDF = Help file (Help Development Kit)
HDF = Hierarchical Data Format bitmap image (NCSA)
HDF = Mime: application/x-hdf
HDF = Procomm Plus alternate download file listing
HDL = Procomm Plus Alternate Download File Listing
HDML = Handheld Device Markup Language
HDML = Mime: text/x-hdml
HDMOV = mplayerc.hdmov open with: "%ProgramFiles%\K-Lite Codec Pack\Media Player Classic\mplayerc.exe" "%1" PerceivedType video PerceivedType video Content Type video/quicktime
HDMOV = mplayerc.hdmov open with: Media Player Classic mplayerc.exe "%1" PerceivedType video Content Type video/quicktime
HDP = Magix Musstu file
HDR = Apollo HRDU image format
HDR = Egret datafile
HDR = Pc-File+ database Header
HDR = Procomm Plus/1st Reader Message Header
HDRU = Apollo HRDU image format
HDS = Hierarchical Data System
HDT2 = (MAC FILE_TYPE) Hard Disk Toolkit
HDV = Formula 1 car race 2001 Season01 Vehicles Arrows file
HDW = Drawing; Harvard Draw for Windows
HDX = Help index (AutoCAD/Zortech C++)
HEA = Game: fifa 2001 data feart legalscr file
HEARTSSAVE-MS = MicrosoftHeartsSaveFile open with: "%ProgramFiles%\Microsoft Games\Hearts\Hearts.exe" "%L"
HEATSEEK = Heatseeker mc1.0 format
HEC = Grafic Pvquan Quant file
HED = HighEdit document
HEL = Microsoft Hellbender saved game
help = (MAC FILE_TYPE) Apple Guide
Help = (MAC FILE_TYPE) Help File
HELP = (MAC FILE_TYPE) Microsoft Help File
HELP = Mime: application/x-helpfile
HEP = Novell NetWare Help Librarian data file
HER = Grafic Gif file
HEX = (Macintosh) BinHex encoded file archive (ASCII)
HEX = Hex dump
HF = HF image format
HFB = Ralcgm file
HFI = Hp Font Info file (GEM)
HFX = HotFax data
HGL = Hewlett-Packard Graphics Language
HGL = Highlight groups definitions (DN)
HGL = Mime: application/vnd.hp-HPGL
HGS = Harvard Graphics : Graphics
HGT = Battle Zone Data File
HGT = SRTM terrain data
HH = C++ header file
HH = Mime: text/plain
HH = Mime: text/x-h
HHC = HTML Help Table Of Contents file, funtional comparable with .cnt
HHG = THHG EUROPEAN HEADQUARTER
HHH = Power C precompiled header file
HHK = MS HTML Help Index
HHL = Visual basic file
HHP = HTML Help project file, funtional comparable with .hpj
HHP = Procomm Plus help information for remote users
HHTML = Realmedia adstream html file
HI = High scores (various games)
HIF = Quicken intuit(old) de online file
HIG = High scores (various games)
HImg = (MAC FILE TYPE) Image file created by Toast 3
HIN = Hyperchem HIN chemical modeller input file
HIN = Hyperchem HIN chemical modeller output file
HIN = HyperChem molecule
HIPS = Bitmap image
HIR = Hires C64 image format
HIREX = HIREx Data Specification
HIS = HIStory of executing/viewing/editing (DN)
HIT = HitPlayer Audio File
HIX = System Sysutil file
HJT = editor treepad file
HKC = HTML-KIT auto complete short-cuts
hkdb = (MAC FILE_TYPE) iTunes Music Library
HKS = Hook Script
HL$ = MS compressed HLP (DOS help file); decompress with UNPACK.EXE
HL_ = Compr. Scanner us driver file
HLB = Mime: text/x-script
HLB = VMS help library
HLF = Basic Quickbas Quickb01 file
HLL = Boulderdash game file
HLM = Winhelp Vbhilfe file
HLP = HeLP file : various prgs,for Winhelp.exe or Winhlp32.exe
HLP = Mime: application/hlp
HLP = Mime: application/winhlp
HLP = Mime: application/x-helpfile
HLP = Mime: application/x-winhelp
HLS = Winhelp file
HLX = MultiEdit help file
HLX2 = (MAC FILE_TYPE) Apple DocViewer
HLZ = MultiEdit packed help file
HM = Windows Help context IDs used by MAKEHM.EXE
HM2 = Help&Manual Help File Project
HMGD = (MAC FILE_TYPE) Microsoft Grammar File
HMHD = (MAC FILE_TYPE) Word Hyphenation File
HMI = MIDI music
HMM = Procomm Plus Alternate Mail option menu
HMP = MIDI music
HMSD = (MAC FILE_TYPE) Microsoft Dictionary
HMY = Hemingway2.exe (plugin for Hemingyway Content Management System: www.altuit.com)
HM~ = Help&Manual Backup Help File Project
HNC = CNC program files Heidenhain dialog??
HNF = Humax Receiver Settings
HOB = Z80 Spectrum Emulator Snap/File Formats
HOF = 'Hall Of Fame' game data = best scores
HOG = Lucas Arts Dark Forces WAD file
HOL = holfile open with: "%ProgramFiles%\MICROS~1\Office10\OUTLOOK.EXE" /hol "%1"
HOL = Outlook.File.hol open with: "%ProgramFiles%\MICROS~3\Office12\OUTLOOK.EXE" /hol "%1"
HOL = Outlook.File.hol open with: "C:\PROGRA~1\MICROS~3\Office12\OUTLOOK.EXE" /hol "%1"
HOT = Mosaic Internet address
HOWTO = doxygen file
HP = Printout file (HP Graphics Language )for HP printers/plotters (HP/GL)
HP = Thor database primary hash file
HP$ = Ntgraph Visual c wizzard file
HP- = Dist Bin file for Hp
HP-UX = File for Hp-unix
HP8 = Text in HP Roman8 character set (NewWave Write)
HP_ = Winhelp file (compressed)
HPC = System Dll file
HPF = PageMaker HP LaserJet fonts
HPFS = OS/2 High Performance File System
HPG = Mime: application/vnd.hp-HPGL
HPG = Vector image (HPGL plotter file) (AutoCad/Harvard Graphics)
HPGL = Mime: application/vnd.hp-HPGL
HPGL = Vector image (HPGL plotter file) (Hewlett-Packard Graphics Language)
HPGL2 = Hewlett Packard Graphics Language 2
HPH = Designer graphics System2 file
HPI = GEM font information
HPI = Hemera Photo Image image format
HPI = Mime: application/vnd.hp-hpid
HPID = Mime: application/vnd.hp-hpid
HPJ = Ms Help Compiler Help ProJect file, used to combine .hm and .rtf files to a compiled .hlp file
HPJ = Printed to file (HP LaserJet)
HPK = HPack compressed file archive
HPL = Vector image (Hewlett-Packerd LaserJet)
hplg = (MAC FILE_TYPE) iTunes Device Plugin
HPLJ = Vector image (Hewlett-Packerd LaserJet)
HPM = Alternate Main menu for privileged users (Procomm Plus)
HPM = Emm text (HP NewWave)
HPM = Quaestor 1.x High Performance Map
HPP = C++ header (Zortech C++/Watcom C/C++)
HPP = Vector image (Hewlett-Packard Printer Control Language)
HPPCL = Vector image (Hewlett-Packard Printer Control Language)
HPR = RoboHelp Configuration
HPS = Mime: application/vnd.hp-hps
HPUX = File for Hp-ux
HPW = CompuServe Home Page Wizard
HP~ = V-help file
HQR = Little Big Adventure HQR and VOX files
HQX = BinHex archive format, orig. Macintosh
HQX = Mime: application/binhex
HQX = Mime: application/binhex4
HQX = Mime: application/mac-binhex
HQX = Mime: application/mac-binhex40
HQX = Mime: application/x-binhex40
HQX = Mime: application/x-mac-binhex40
HR = TRS 80 image format
HRC = SoftImage model 3D file
HRF = CADCore bitmap image (Hitachi Raster Format)
HRH = Common header for resources and C++
HRL = Herolab EasyWin32
HRM = Procomm Plus alternate Main menu for limited/normal users
HRT = Hornet Packer format
HRU = HRU image format
HRX = Herolab EasyWin32
HRZ = SSTV = Slow Scan TeleVision file
HS = Literate Haskell source code file
HS2 = Postering monochrome image
HSC = 2-op FM music file (HSC tracker)
HSDL = Hierarchical Scan Description Language
HSI = Handmade Software Inc bitmap image (Image Alchemy)
HSM = Assembly language header (University of Waterloo Engineering convention)
HSP = HomeSite WWW page project
HSQ = Data File Associated with Qaz Trojan
HSQL = htmSQL : SQL statements embedded in HTML
HSS = Photoshop Hue/Saturation Information
HSS = Hue/Saturation data(many prgs)
HST = Handmade Software graphics histogram (HSI raw file) (Image Alchemy)
HST = HiSTory file
HT = HyperTerminal file
HT3 = HTML file Version 3 (uncommon)
HT4 = HTML file Version 4 (uncommon)
HTA = HTML program
HTA = Mime: application/hta
HTA = Tonline Bsw4 file
HTACCESS = Apache Access Configuration File
HTC = HTML code
HTC = Mime: text/x-component
HTF = WebBase File
HTI = Win Help related file
HTK = Winamp.File open with: "%ProgramFiles%\Winamp\winamp.exe" "%1"
HTLC = (MAC FILE_TYPE) Hotline Client
HTM = HyperText Markup Language file (WWW-page)
HTM = Mime: text/html
HTMHJT = Treepad HTML files(with text)
HTMHTML = 3rdparty html file
HTML = HyperText Markup Language file (WWW-page)
HTML = Mime: text/html
HTML@ID=54344945&SUCHBEGRIFF=RINDENWANZEN&TOP=LEXIKON = html@id=54344945&suchbegriff=Rindenwanzen&top=Lexikon_auto_file open with: %SystemRoot%\system32\NOTEPAD.EXE %1
HTMLS = HyperText Markup Language document with server-side include (Internet)
HTMLS = Mime: text/html
HTN = Micrografx Picture Publisher 8 printstyles file
HTR = HTML-like script
HTT = Microsoft HyperText Template
HTT = Mime: text/webviewhtml
HTVW = (MAC FILE_TYPE) HTML Viewer
HTW = htmlfile open with: Internet Explorer -nohome
HTX = Mime: text/html
HTX = MS FrontPage database results, HTML-like query script
HUF = Huffman encoded/compressed file
HUN = Dataview file
HUS = Husqvarna embroidery machines file format
HUV = graphic files read by Husqvarna Viking Designer 1 sewing machine (embroidery files that control stitching of the designs)
HUY = Eto Dlia Vas
HW3 = Hyperwriter! Document
HWD = Hollywood presentation
HWL = Corel Shared Writing Tools 9.0 file
HWOF = (MAC FILE_TYPE) Microsoft Office Help
HWP = Hangul (Korean) Word Processor File
HX = Cross-reference hash file (THOR database)
HX_ = C Poet compressed Disk1 file
HXA = MSHelp.hxa.2.5 Content Type application/xml
HXA = MSHelp.hxa.2.5 special configuration file for application(binary format) Content Type application/xml
HXC = MSHelp.hxc.2.5 Content Type application/xml
HXC = MSHelp.hxc.2.5 special configuration file for application(binary format) Content Type application/xml
HXD = MSHelp.hxd.2.5 Content Type application/octet-stream PerceivedType system
HXD = MSHelp.hxd.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/octet-stream
HXE = MSHelp.hxe.2.5 Content Type application/xml
HXE = MSHelp.hxe.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/xml
HXF = MSHelp.hxf.2.5 special configuration file for application(binary format) Content Type application/xml
HXF = MSHelp.hxf.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/xml
HXH = MSHelp.hxh.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/octet-stream
HXI = MSHelp.hxi.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/octet-stream
HXK = MSHelp.hxk.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/xml
HXM = Alternate Protocol Selection menu for all users (Procomm Plus)
HXQ = MSHelp.hxq.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/octet-stream
HXR = MSHelp.hxr.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/octet-stream
HXS = MSHelp.hxs.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/octet-stream
HXT = MSHelp.hxt.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/xml
HXV = MSHelp.hxv.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/xml
HXW = MSHelp.hxa.2.5 special configuration file for application(binary format) PerceivedType system PerceivedType system Content Type application/octet-stream
HXX = C++ header, see H, H++
HY1 = Ventura Publisher hyphenation algorithms
HY2 = Ventura Publisher hyphenation algorithms
HYC = WordPerfect data
HYD = WordPerfect for Win hyphenation dictionary
HYM = 3D Image binary file (Hymarc Scandata Scanner)
HYP = Hyper compressed file archive
HZ = Chinese text

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Universal dump-utility for non-destructive dump/list/search string etc dump.zip

Select Extension by starting letter:

A- B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U -

V- W - X - Y - Z - OTHER - Allowed chars in Filenames - what is an extension?

 

If you find an extension missing, write! No guarantee given for completeness or correctness. If you feel an extension is outdated, write!
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Compilation Copyright (c) 2002 R.Bitsch, Compilation Copyright (c) 2009,2010 R.Cooper-Bitsch