H
| Ext. | Description | Used by |
|---|---|---|
| H! | On-line help file | Flambeaux Help! Display Engine |
| H! | Pertext database | HELP.EXE |
| H-- | C—language header | Sphinx C-- |
| H | Header file (usually C language) | Watcom C/C++ |
| H++ | Header file | C++ |
| HA | Archive | HA |
| HAL | Data file | Hyper Access Lite OS/2 |
| HAM | Disk Drivers NPA | Novell NetWare |
| HAM | Hold And Modify | Deluxe Paint image file |
| HAP | Archive | HAP3 |
| HBC | Compressed Archive File (Shrink Algorithm) | Hyperbac |
| HBC | Compressed Archive File (Shrink Fast Algorithm) | Hyperbac |
| HBE | Compressed, Encrypted Archive File (Shrink & AES256-bit Encryption) | Hyperbac |
| HBK | MathCAD handbook | MathCAD |
| HC | Header file | |
| HCG | Document | HCLab |
| HCGS | Document | HCLab |
| HDD | data | disk image |
| HDD | HotDisc Designer label | |
| HDF | Amiga Hard Disk Image | |
| HDF | Help file | Help Development Kit |
| HDF | Hierarchical Data File graphics file | SDSC Image Tools |
| HDL | Alternate download file listing | Procomm Plus |
| HDMP | heap dumpfile | |
| HDR | Datafile | Egret |
| HDR | Message header text | Procomm Plus - 1st Reader |
| HDR | PC-File+ Database header | |
| HDR | SPOT image file | |
| HDS | Hierarchical Data System | |
| HDW | Vector graphics | Harvard Draw |
| HDX | Help index | AutoCAD - Zortech C++ |
| HDZ | Amiga Zip compressed Hard Disk Image | |
| HEP | Novell Help Librarian Data File | Novell NetWare |
| HEX | Hex dump | |
| HFI | HP Font Info file | GEM |
| HGL | Highlight groups definitions | DN |
| HGL | HP Graphics Language graphics file | |
| HH | C++ header file | |
| HHH | Precompiled header file | Power C |
| HHP | Help information for remote users | Procomm Plus |
| HI | Game high scores table | |
| HIN | Molecule | HyperChem |
| HIS | History of executing/viewing/editing | DN |
| HIS | Yard Information File | FYM |
| HKM | Stores sound in a bitmapped graphics file | |
| HLB | Help library | VAX |
| HLP | Help file | WinHelp, Help Explorer Viewer |
| HLX | Multi Edit help file | MultiEdit 5.0 |
| HLZ | Multi Edit packed help file | MultiEdit |
| HMI | Music format (MIDI) | |
| HMM | Alternate Mail Read option menu | Procomm Plus |
| HMP | Music format (MIDI) | |
| HMP | Hump Setup File - Obsolete as of version 2.4 (See SET and SWT files) | FYM |
| HNC | CNC program files Heidenhain (?) dialog | |
| HOF | Hall Of Fame (game scores) | |
| HOM | CAD Software Data File | PLXHOME |
| HP | Printout file for HP printers/plotters (HP/GL) | |
| HP8 | ASCII text HP Roman8 character set | NewWave Write |
| HPF | HP LaserJet fonts | PageMaker |
| HPG | see HPGL | |
| HPGL | Plotter file vector graphics (Hewlett-Packard Graphics Language) | AutoCad - Harvard Graphics |
| HPI | Font information file | GEM |
| HPJ | Help project | Microsoft Help Compiler for Windows - HC.EXE |
| HPK | Archive | HPACK |
| HPM | Alternate Main menu for privileged users | Procomm Plus |
| HPM | EMM text | HP NewWave |
| HPM | High Performance Map | Quaestor 1.x |
| HPP | C++ header file | Zortech C++ - Watcom C/C++ |
| HPPCL | Hewlett-Packard Printer Control Language | |
| HQX | Archive (ASCII Mac) | BINHEX |
| HRF | Graphics file (Hitachi Raster Format) | |
| HRM | Alternate Main menu for limited/normal users | Procomm Plus |
| HRZ | Graphics format | SSTV |
| HS2 | Monochrome image | Postering |
| HSC | 2-op FM music | HSC tracker - hscplay.exe |
| HSH | Disk image hash file | DriveSnapshot |
| HSI | Handmade Software Inc. graphics file almost JPEG | Image Alchemy |
| HST | History file | Procomm Plus |
| HTM | see HTML | |
| HTML | Hypertext Markup Language (WWW) | Netscape - Mosaic - many |
| HTX | Hypertext file | |
| HWA | Hollywood applet | Hollywood |
| HWD | Presentation | Hollywood Designer |
| HWP | Hangul Word Processor Document | Hangul (word processor) |
| HWS | Hollywood script | Hollywood |
| HXM | Alternate Protocol Selection menu for all users | Procomm Plus |
| HXS | Microsoft Help 2 compiled help file | Microsoft Windows, Help Explorer Viewer |
| HXX | C++ header file | |
| HY1 | Hyphenation algorithms | Ventura Publisher |
| HY2 | Hyphenation algorithms | Ventura Publisher |
| HYC | Data | WordPerfect |
| HYD | Hyphenation dictionary | WordPerfect for Win |
| HYP | Archive | HYPER |
Read more about this topic: List Of File Formats (alphabetical)