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Website  EXT   Filetype description                                    
    FileInfo  AHD  Dynamics AX Online Help Data File 
    FileInfo  AHI  Dynamics AX Online Help Index File 
    FILExt  AHP  AutoCAD Help (Autodesk Inc.) 
    File Extensions  AHP  Help file (AutoCAD
    File Extensions  AKW  A-Keywords (RoboHELP Help project index designer
    FILExt  AKW  RoboHELP Help Project Index File 
    Cryer  ALS  Part of the Delphi help file system 
    File Extensions  ALTV  MAC file type - help file 
    FILExt  ANN  Help Annotation 
    Wikipedia  ANN  Help Annotations - Windows 3.x 
    FileInfo  ANN  Help Annotations 
    File Extensions  ANN  Windows Help annotation 
    File Extensions  AW  Help Wizard Answer Wizard 
    FILExt  AWH  ActiveWorlds Browser Help File (Activeworlds Inc.) 
    File Extensions  BMK  Bookmark file from Windows help 
    FILExt  BMK  Help Bookmark 
    Wikipedia  BMK  Help Bookmarks - Windows 3.x 
    FileInfo  BMK  Help Bookmarks 
    FILExt  CHI  Help File Index (Microsoft Corporation
    Cryer  CHI  Help file index 
    TrID  CHI  Windows HELP Index 
 Header Hexdump:  49 54 53 46 03 00 00 00 60 00 00 00 01 00 00 00 
    FILExt  CHJ  Help Composer Project 
    File Extensions  CHJ  Help Composer Project 
    Wikipedia  CHM  Compiled Help File - Microsoft Windows, Help Explorer Viewer 
    FileInfo  CHM  Compiled HTML Help File 
    Cryer  CHM  Compiled HTML help file 
    FILExt  CHM  HTML Help Compiled Help File (Microsoft Corporation
    File Extensions  CHM  Microsoft Compiled HTML help file 
    TrID  CHM  Windows HELP File 
 Header Hexdump:  49 54 53 46 
    FILExt  CHQ  Help Combined Full-text Search File (Microsoft Corporation
    File Extensions  CHQ  WIN Help file 
    FileInfo  CHW  Compiled Help Index File 
    File Extensions  CHW  HTML Help general index funtional comparable with .gid 
    FILExt  CHW  HTML Help General Index Funtionally comparable to .GID. 
    Cryer  CNT  Contents file for a windows help file 
    FileInfo  CNT  Help Contents File 
    FILExt  CNT  Help File Contents 
    TrID  CNT  Help File Contents 
 Header Hexdump:  3A 
    FILExt  COL  HTML Help Collection File (Microsoft Corporation
    TrID  COL  HTML Help Collection 
 Header Hexdump:  3C 58 4D 4C 3E 0D 0A 3C 48 54 4D 4C 48 65 6C 70  
    FILExt  CVH  CVTracker Proprietary Help File (Netmap Software Inc.) 
    FILExt  DHE  Help Workshop Dialog Box Help Editor Document (Microsoft Corporation
    FILExt  DHE  Visual Basic Dialog Box Help Editor Document 
    File Extensions  DHE  Visual Basic Dialog Box help editor document 
    FILExt  DHF  Help Maker File 
    File Extensions  DHF  Help Maker file 
    FILExt  DSZ  Win Help Related File 
    File Extensions  DSZ  Win Help related file 
    FILExt  ELH  Electronic Application Help File 
    File Extensions  FIH  File Investigator Help File 
    FILExt  FLS  ArcView Windows Help Supporting File (ESRI
    FILExt  FTG  ArcView UNIX Help Supporting File (ESRI
    File Extensions  FTG  Windows Help file 
    FILExt  FTG  Windows Help Full-text Search Group File 
    FILExt  FTS  ArcView UNIX Help Supporting File (ESRI
    FILExt  FTS  CHASE Evaluation and Audit System Help File (CHASE.FTS) (Health And Safety Technology And Management Ltd.) 
    Cryer  FTS  Help index file 
    FILExt  FTS  Windows Help Full-Text Search Index File (Microsoft Corporation
    TrID  FTS  Windows Help Full-Text Search index file 
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    File Extensions  FTS  Windows Help index 
    File Extensions  GID  General index of a Win 95 help files 
    TrID  GID  GID Help index 
 Header Hexdump:  3F 5F 03 00 
    Wikipedia  GID  Help index - windows 95 help 
    Cryer  GID  Windows (help) global index 
    FILExt  GID  Windows Help Index File (Microsoft Corporation
    FileInfo  GID  Windows Help Index File 
    File Extensions  H!  Flambeaux Help 
    Wikipedia  H!  On-line help file - Flambeaux Help! Display Engine 
    File Extensions  H!  Perfect Database help database 
    Wikipedia  H!  Pertext database - HELP.EXE 
    File Extensions  H1C  Windows Vista file related to Assistance Platform (AP) help 
    File Extensions  H1F  Microsoft Windows Assistance Platform client help file 
    File Extensions  H1K  Keyword index - Microsoft Windows Assistance Platform client help related file 
    File Extensions  H1S  Microsoft Windows Assistance Platform client help file 
    File Extensions  H1T  Microsoft Windows Assistance Platform client help related file 
    File Extensions  H1V  Task metadata file - Microsoft Windows Assistance Platform client help related file 
    FILExt  HCW  HTML Help Workshop Conversion Wizard Macro (Microsoft Corporation
    FILExt  HDF  Help Development Kit Help File 
    Wikipedia  HDF  Help file - Help Development Kit 
    File Extensions  HDF  Help file 
    Wikipedia  HDX  Help index - AutoCAD - Zortech
    File Extensions  HDX  Help index (AutoCAD/Zortech C++) 
    FILExt  HDX  Help Index 
    Wikipedia  HEP  Novell Help Librarian Data File - Novell NetWare 
    FILExt  HEP  Novell NetWare Help Librarian Data File 
    File Extensions  HEP  Novell NetWare Help Librarian data file 
    FILExt  HH  Help Topic Map File 
    FILExt  HHC  HTML Help Table of Contents (Microsoft Corporation
    File Extensions  HHC  HTML Help Table Of Contents file 
    FileInfo  HHC  HTML Help Table of Contents 
    Cryer  HHC  HTML Help Workshop Contents file 
    FILExt  HHK  HTML Help Index (Microsoft Corporation
    FileInfo  HHK  HTML Help Index 
    Cryer  HHK  HTML Help Workshop Index file 
    File Extensions  HHK  MS HTML Help Index 
    Wikipedia  HHP  Help information for remote users - Procomm Plus 
    File Extensions  HHP  HTML Help project file funtional comparable with .hpj 
    FILExt  HHP  HTML Help Workshop Project (Microsoft Corporation
    Cryer  HHP  HTML Help Workshop Project file 
    File Extensions  HHP  Procomm Plus help information for remote users 
    FILExt  HHS  HTML Help Samples (Microsoft Corporation
    FileInfo  HHT  Help and Support Center HHT File 
    FILExt  HL$  Compressed DOS Help File (Microsoft Corporation
    File Extensions  HL$  MS compressed HLP (DOS help file) decompress with UNPACK.EXE 
    Wikipedia  HLB  Help library - VAX 
    FILExt  HLB  VAX Help Library 
    FileInfo  HLB  VMS / VAX Help Library 
    File Extensions  HLB  VMS help library 
    TrID  HLF  FAR help 
 Header Hexdump:  2E 4C 61 6E 67 75 61 67 65 3D 
    FILExt  HLF  FAR Manager Help File (FAR Group
    FILExt  HLP  Advisor Help File (Microsoft Corporation
    Wikipedia  HLP  Help file - WinHelp, Help Explorer Viewer 
    FILExt  HLP  HP-95LX Help File 
    TrID  HLP  HP200LX System Application's Help 
    TrID  HLP  Microsoft Advisor Help file 
 Header Hexdump:  4C 4E 02 00 
    File Extensions  HLP  Microsoft Help file 
    FILExt  HLP  Stata Statistical Software Help File (Stata Corporation
    FILExt  HLP  Windows Help File (Microsoft Corporation
    FileInfo  HLP  Windows Help File 
    TrID  HLP  Windows HELP File 
 Header Hexdump:  3F 5F 03 00 
    Cryer  HLP  Windows standard help file 
    FILExt  HLX  Help Magician Help Text File (Software Interphase Inc.) 
    TrID  HLX  Help Magician text file 
 Header Hexdump:  5B 56 51 48 4C 50 45 44 46 49 4C 45 5F 
    FILExt  HLX  Multi-Edit Help File 
    Wikipedia  HLX  Multi Edit help file - MultiEdit 5.0 
    File Extensions  HLX  MultiEdit help file 
    FILExt  HLZ  Multi-Edit Packed Help File 
    Wikipedia  HLZ  Multi Edit packed help file - MultiEdit 
    File Extensions  HLZ  MultiEdit packed help file 
    FILExt  HM  Windows Help Context IDs used by MAKEHM.EXE. 
    File Extensions  HM  Windows Help context IDs used by MAKEHM.EXE 
    File Extensions  HM~  Help& Manual Backup Help File Project 
    FILExt  HM~  Help&Manual Backup Help File Project 
    FILExt  HM2  Help & Manual Ver 2 Help File Project (EC Software GmbH
    File Extensions  HM2  Help& Manual Help File Project 
    FileInfo  HM3  Help & Manual 3 Project 
    FILExt  HM3  Help & Manual Ver 3 Help File Project (EC Software GmbH
    FILExt  HMP  Help Magician Help Project File (Software Interphase Inc.) 
    TrID  HMP  Help Magician Project 
 Header Hexdump:  48 4D 20 50 72 6F 6A 65 63 74 20 46 69 6C 65 20  
    FILExt  HMSKIN  Help & Manual Ver 5 Help File Skin (EC Software GmbH
    FileInfo  HMX  Help & Manual 4 Project 
    FILExt  HMX  Help & Manual Ver 4 Help File Project (EC Software GmbH
    FILExt  HMXP  Help & Manual Ver 5 Help File Uncompressed XML Project (EC Software GmbH
    FILExt  HMXZ  Help & Manual Ver 5 Help File Compressed XML Project (EC Software GmbH
    FILExt  HP~  V-help File 
    File Extensions  HP~  V-help file 
    Wikipedia  HPJ  Help project - MS Help Compiler for Windows - HC. EXE 
    FileInfo  HPJ  Help Project File 
    FILExt  HPJ  Help Project File 
    File Extensions  HPJ  Ms Help Compiler Help ProJect file used to combine .hm and .rtf files to a compiled .hlp file 
    FILExt  HPJ  Visual Basic Help Project 
    FILExt  HTI  Win Help Related File 
    File Extensions  HTI  Win Help related file 
    FILExt  HWPROJ  Visual Studio .NET Help Project (Microsoft Corporation
    FILExt  HXC  Help 2 Project/Collection File (Microsoft Corporation
    FILExt  HXD  Help 2 Validator File (Microsoft Corporation
    FILExt  HXF  Help 2 Include File (Microsoft Corporation
    FILExt  HXG  Help 2 Filter Cache (Microsoft Corporation
    FILExt  HXH  Help 2 Merged Hierarchy (Microsoft Corporation
    FILExt  HXI  Help 2 Compiled Help File (Microsoft Corporation
    FILExt  HXK  Help 2 Keyword Index (Microsoft Corporation
    FILExt  HXK  Help TOC/Index File 
    FILExt  HXL  Help 2 Registered Namespaces List (Microsoft Corporation
    FILExt  HXS  Help 2 Compiled Help File (Microsoft Corporation
    FileInfo  HXS  Help 2 Compiled Help File 
    TrID  HXS  Microsoft compiled help format 2.0 
 Header Hexdump:  4D 5A 
    Wikipedia  HXS  Microsoft Help 2 compiled help file - Microsoft Windows, Help Explorer Viewer 
    FILExt  HXT  Help 2 Table of Contents (Microsoft Corporation
    TrID  HXT  Help Table of Contents 
 Header Hexdump:  3C 3F 78 6D 6C 20 76 65 72 73 69 6F 6E 3D 22 31  
    FILExt  HXT  Help TOC/Index File 
    FILExt  HXV  Help 2 Virtual Topic Definition (Microsoft Corporation
    FILExt  HXW  Help 2 Merged Keyword Index (Microsoft Corporation
    File Extensions  IHP  Watcom : Help file 
    Wikipedia  IHP  Watcom help file - whelp.exe 
    FILExt  IHP  Watcom Help File 
    File Extensions  INF  Hypertext help system file (OS/2 Buch
    FILExt  INF  OS/2 Buch Hypertext Help System File 
    Wikipedia  INF  OS/2 hypertext help system file - VIEW.EXE 
    FileInfo  IPF  OS/2 Help File 
    FILExt  IPP  Help & Manual Proprietary Image (EC Software GmbH
    FILExt  JQX  Windows Help Related File (Microsoft Corporation
    FileInfo  KHD  Dynamics AX Kernel Help Data File 
    FileInfo  KHI  Dynamics AX Kernel Help Index File 
    FILExt  KKW  RoboHELP Keyword Help Project Index File 
    File Extensions  KKW  RoboHELP Keyword Help project Index File 
    FILExt  LCK  Help 2 Lock File (Microsoft Corporation
    File Extensions  MBOX  Os-help mbox file 
    FILExt  MSG  OS/2 Help Message File (IBM) 
    File Extensions  MSG  OS/2 Help message file 
    FILExt  NF  CVIP NF_help File 
    File Extensions  NF  Cvip nf_help file 
    Wikipedia  NFO  Help format - Nextpage Folio 
    File Extensions  NFO  Netware Folio help format 
    File Extensions  NOTE  WordPerfect for Mac help document 
    FILExt  NOTE  WordPerfect for Macintosh Help Document (Corel Corporation
    File Extensions  NVD  Aolpress Help file 
    FILExt  NVD  AOLpress Help 
    File Extensions  NVM  Aolpress Help file 
    FILExt  NVM  AOLpress Help 
    FILExt  OBD  Oracle Forms Online Help File (Oracle
    FILExt  PBH  PowerBASIC Help File (PowerBASIC Inc.) 
    File Extensions  PBH  PowerBasic Help file 
    FILExt  PH  Help Compiler Phrase Table 
    File Extensions  PH  Windows Help file phrase-table created by HC.EXE 
    FILExt  PHD  PC Help Desk File 
    File Extensions  PHD  PC Help Desk File 
    FileInfo  PSI  PrimalScript Online Help Shortcut 
    Wikipedia  QCH  Qt Compressed Help - Trolltech Qt Assistant 
    Wikipedia  QHC  Qt Help Collection - Trolltech Qt Assistant 
    Wikipedia  QHCP  Qt Help Collection Project - Trolltech Qt Assistant 
    Wikipedia  QHP  Qt Help Project - Trolltech Qt Assistant 
    FILExt  QLC  PostScript Help File 
    Wikipedia  RTF  Rich Text Format text file (help file script) - many - MS Word 
    FILExt  RXH  Reflex Database Help File (Borland Software Corporation
    File Extensions  RXH  Reflex Database Help File 
    FILExt  SCRIPT  Win Help Related File 
    File Extensions  SCRIPT  Win Help related file 
    FILExt  SGD  Lahey Blackbeard Help File 
    File Extensions  SGD  Lahey Blackbeard help file 
    FILExt  SGX  Lahey Fortran Help File Index 
    File Extensions  SGX  Lahey Fortran help file index 
    File Extensions  SHG  'Segmented Hypergraphics' Bitmap with hot-spots created by 'SHED.EXE' compiled with 'HC.EXE' (Windows help file compiler
    FILExt  SHI  Simple Help Editor Settings File (The Pandaware Company
    FILExt  SRV  Help Maker File 
    File Extensions  SRV  Help Maker file 
    File Extensions  SWI  files created by Swish (help in making Macromedia Flash files
    Wikipedia  T?H  Turbo Help file (Pascal, C, Assembler, ...) - Borland Thelp 
    Wikipedia  TAH  Help file for Turbo Assembler - Borland
    FILExt  TAH  Turbo Assembler Help File (Borland Software Corporation