Knowledge

Microsoft Compiled HTML Help

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The information available is scarce, but any VM installation of WinNT 4.0 appears to give .CHM file support out of the box. It seems like it wasn't introduced in in Windows NT 3.51 due to NT 3.51 being intentionally limited to Internet Explorer 16-bit
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Microsoft's HTML Help Workshop and Compiler generate CHM files by instructions stored in a HTML Help project. The file name of such a project has the extension .HHP and the file is just a text with the
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pages, an index and other navigation tools. The files are compressed and deployed in a binary format with the extension .CHM, for Compiled HTML. The format is often used for
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can decompile CHM files. The hh.exe utility on Windows and the extract_chmLib utility (a component of chmlib) on Linux can also decompile CHM files.
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At the WritersUA (formerly WinWriters) conference, Microsoft announces plans for a new help platform, Help 2, which is also HTML based.
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table of contents, and an index file. The file format has been reverse-engineered and documentation of it is freely available.
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Help is delivered as a binary file with the .chm extension. It contains a set of HTML files, a
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since IE 4 is bundled with OSR 2.5, hence adding the CHM file support for the first time
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Microsoft has announced that they do not intend to add any new features to HTML Help.
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announces plans to stop development of WinHelp and start development on HTML Help.
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project has a compiler (chmcmd) that can create CHM files in a multiplatform way.
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Extended character support, although it does not fully support
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Salomon, David; Motta, Giovanni; Bryant, David (CON) (2009).
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and is now supported in many document viewer applications.
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Various applications, such as HTML Help Workshop and
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Springer. 2775: 851: 635:Comparison of documentation generators 354:The file starts with bytes "ITSF" (in 175:It was introduced as the successor to 164:format, consisting of a collection of 2633:Next-Generation Secure Computing Base 1007: 653:Techtonik, Anatoly (11 April 2006). 546:(PowerPC apps no longer supported), 1762:Distributed Transaction Coordinator 13: 2093:User Interface Privilege Isolation 14: 2804: 971: 329:Microsoft decides not to release 2755: 2745: 2744: 1822:Remote Differential Compression 946: 917: 891: 867: 845: 809:"Microsoft HTML Help Downloads" 427:Use in non-Windows applications 16:Online help format by Microsoft 2678:Windows System Assessment Tool 953:Wise, Paul; Wing, Jed (2005). 830:Wise, Paul; Wing, Jed (2005). 823: 801: 777: 771: 765: 759: 735: 711: 705: 700: 694: 668: 646: 567:Other / Cross-platform: xCHM, 342: 1: 655:"application/vnd.ms-htmlhelp" 640: 302:HTML Help 1.33 releases with 283:HTML Help 1.32 releases with 1967:Open XML Paper Specification 1827:Remote Installation Services 1035:Microsoft Windows components 928:Handbook of Data Compression 333:as a general Help platform. 154:Microsoft Compiled HTML Help 91:Microsoft Compiled HTML Help 20:Microsoft Compiled HTML Help 7: 2119:Windows Subsystem for Linux 2078:Mandatory Integrity Control 1832:Windows Deployment Services 1629:Wireless Zero Configuration 618: 387:Use in Windows applications 206: 43:application/vnd.ms-htmlhelp 10: 2809: 2221:Universal Windows Platform 1927:Kernel Transaction Manager 1912:Hardware Abstraction Layer 1609:Multimedia Class Scheduler 983:Microsoft Help 2 Reference 978:HTML Help Web Page on MSDN 852:Palade, Alexandru (2005). 256:HTML Help 1.1a ships with 202: 191:and is still supported in 2740: 2700: 2673:Windows Services for UNIX 2595: 2364: 2283: 2276: 2249: 2132: 2106: 2058:Data Execution Prevention 2030: 1907:Graphics Device Interface 1855: 1797:Network Access Protection 1722: 1637: 1584: 1484: 1416:Remote Desktop Connection 1249: 1079: 1041: 676:"Microsoft HTML Help 1.4" 298: 271:HTML Help 1.3 ships with 267: 139: 129: 119: 107: 95: 78: 66: 58: 48: 36: 24: 2038:Security and Maintenance 1982:Security Account Manager 1576:Windows XP visual styles 789:community.spiceworks.com 365:Data compression (using 38:Internet media type 2788:Technical communication 2623:Media Control Interface 2457:Help and Support Center 2073:Kernel Patch Protection 1837:System Resource Manager 1817:Remote Desktop Services 1812:Print Services for UNIX 1594:Service Control Manager 1204:Windows Error Reporting 1124:DirectX Diagnostic Tool 998:the Russotto.net domain 2603:Desktop Cleanup Wizard 2179:COM Structured storage 1880:Desktop Window Manager 1772:Windows Media Services 607:like tool, a separate 372:Built-in search engine 170:software documentation 2231:Windows Mixed Reality 1902:Enhanced Write Filter 1752:Roaming user profiles 879:www.virusbulletin.com 285:Internet Explorer 5.5 2512:Mobile Device Center 2462:Health & Fitness 2260:Solitaire Collection 2088:User Account Control 2083:Protected Media Path 1987:Server Message Block 1937:Logical Disk Manager 1189:System Policy Editor 1174:System Configuration 989:History of HTML Help 592:Read/write support: 179:with the release of 2658:Virtual DOS machine 2002:System Idle Process 1977:Resource Protection 1885:Portable Executable 1777:Active DRM Services 1179:System File Checker 1149:Performance Monitor 304:Internet Explorer 6 243:Internet Explorer 4 92: 21: 2663:Windows on Windows 2387:Backup and Restore 2199:Transaction Server 1917:I/O request packet 1757:Folder redirection 1426:Speech Recognition 1184:System Information 1139:Management Console 723:docs.microsoft.com 680:Windows Dev Center 557:2019-03-29 at the 534:2018-01-21 at the 507:2014-03-23 at the 492:2018-01-21 at the 197:reverse-engineered 183:and consequently, 181:Windows 95 OSR 2.5 90: 26:Filename extension 19: 2783:Internet Explorer 2770: 2769: 2696: 2695: 2653:Video for Windows 2608:Games for Windows 2477:Internet Explorer 1571:Windows Spotlight 1214:Windows Installer 939:978-1-84882-902-2 337: 336: 177:Microsoft WinHelp 151: 150: 124:Microsoft WinHelp 114:Microsoft Windows 88: 87: 49:Developed by 2800: 2759: 2758: 2748: 2747: 2668:Windows SideShow 2447:Food & Drink 2341:Spider Solitaire 2281: 2280: 2174:ActiveX Document 2142:Active Scripting 2098:Windows Firewall 2053:Credential Guard 1732:Active Directory 1529:Indexing Service 1159:Resource Monitor 1154:Recovery Console 1028: 1021: 1014: 1005: 1004: 966: 965: 963: 961: 950: 944: 943: 931: 921: 915: 914: 912: 910: 905:on 13 March 2016 895: 889: 888: 886: 885: 871: 865: 864: 862: 860: 849: 843: 842: 840: 838: 827: 821: 820: 818: 816: 805: 799: 798: 796: 795: 781: 775: 774: 768: 763: 757: 756: 754: 753: 739: 733: 732: 730: 729: 715: 709: 708: 703: 698: 692: 691: 689: 687: 672: 666: 665: 663: 661: 650: 630:Microsoft Help 2 563:Clearview Reader 561:(Discontinued), 550:(Discontinued), 542:(Discontinued), 538:(Discontinued), 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651: 647: 643: 621: 559:Wayback Machine 536:Wayback Machine 509:Wayback Machine 494:Wayback Machine 429: 389: 345: 205: 74: 59:Initial release 44: 32: 17: 12: 11: 5: 2806: 2796: 2795: 2790: 2785: 2768: 2767: 2765: 2764: 2753: 2741: 2738: 2737: 2735: 2734: 2729: 2724: 2719: 2714: 2708: 2706: 2698: 2697: 2694: 2693: 2691: 2690: 2685: 2680: 2675: 2670: 2665: 2660: 2655: 2650: 2645: 2640: 2635: 2630: 2625: 2620: 2615: 2610: 2605: 2599: 2597: 2593: 2592: 2590: 2589: 2584: 2579: 2574: 2569: 2567:Steps Recorder 2564: 2559: 2554: 2549: 2544: 2539: 2534: 2529: 2524: 2519: 2514: 2509: 2504: 2499: 2494: 2489: 2484: 2479: 2474: 2469: 2464: 2459: 2454: 2449: 2444: 2439: 2434: 2429: 2424: 2419: 2414: 2409: 2404: 2399: 2394: 2389: 2384: 2379: 2374: 2368: 2366: 2362: 2361: 2359: 2358: 2351: 2344: 2337: 2330: 2323: 2316: 2309: 2302: 2295: 2287: 2285: 2278: 2274: 2273: 2271: 2270: 2263: 2255: 2253: 2247: 2246: 2244: 2243: 2238: 2233: 2228: 2223: 2218: 2213: 2208: 2203: 2202: 2201: 2196: 2194:OLE Automation 2191: 2186: 2181: 2176: 2171: 2161: 2160: 2159: 2154: 2149: 2138: 2136: 2130: 2129: 2127: 2126: 2121: 2116: 2110: 2108: 2104: 2103: 2101: 2100: 2095: 2090: 2085: 2080: 2075: 2070: 2065: 2060: 2055: 2050: 2045: 2040: 2034: 2032: 2028: 2027: 2025: 2024: 2019: 2014: 2009: 2004: 1999: 1994: 1989: 1984: 1979: 1974: 1969: 1964: 1962:Object Manager 1959: 1954: 1949: 1944: 1939: 1934: 1929: 1924: 1922:Imaging Format 1919: 1914: 1909: 1904: 1899: 1898: 1897: 1892: 1882: 1877: 1872: 1867: 1861: 1859: 1853: 1852: 1850: 1849: 1844: 1839: 1834: 1829: 1824: 1819: 1814: 1809: 1804: 1799: 1794: 1789: 1784: 1779: 1774: 1769: 1764: 1759: 1754: 1749: 1744: 1739: 1734: 1728: 1726: 1720: 1719: 1717: 1716: 1711: 1706: 1705: 1704: 1699: 1694: 1689: 1684: 1679: 1669: 1664: 1659: 1654: 1649: 1643: 1641: 1635: 1634: 1632: 1631: 1626: 1621: 1619:Task Scheduler 1616: 1611: 1606: 1601: 1596: 1590: 1588: 1582: 1581: 1579: 1578: 1573: 1568: 1563: 1558: 1553: 1552: 1551: 1549:Special folder 1546: 1541: 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590: 589: 579: 565: 525: 511: 479: 469: 451: 431:Read support: 428: 425: 388: 385: 384: 383: 376: 373: 370: 344: 341: 335: 334: 327: 324: 320: 319: 316: 312: 311: 300: 297: 293: 292: 281: 277: 276: 269: 266: 262: 261: 254: 251: 247: 246: 239: 236: 232: 231: 225: 222: 218: 217: 214: 211: 204: 201: 189:Windows NT 4.0 149: 148: 143: 137: 136: 131: 127: 126: 121: 117: 116: 111: 105: 104: 99: 86: 85: 80: 76: 75: 72: 70: 68:Latest release 64: 63: 60: 56: 55: 50: 46: 45: 42: 40: 34: 33: 30: 28: 15: 9: 6: 4: 3: 2: 2805: 2794: 2791: 2789: 2786: 2784: 2781: 2780: 2778: 2763: 2754: 2752: 2743: 2742: 2739: 2733: 2730: 2728: 2725: 2723: 2720: 2718: 2715: 2713: 2710: 2709: 2707: 2705: 2699: 2689: 2686: 2684: 2683:Windows To Go 2681: 2679: 2676: 2674: 2671: 2669: 2666: 2664: 2661: 2659: 2656: 2654: 2651: 2649: 2646: 2644: 2641: 2639: 2636: 2634: 2631: 2629: 2626: 2624: 2621: 2619: 2616: 2614: 2611: 2609: 2606: 2604: 2601: 2600: 2598: 2594: 2588: 2585: 2583: 2580: 2578: 2575: 2573: 2570: 2568: 2565: 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2717:File Manager 2557:Photo Viewer 2492:Media Center 2452:Groove Music 2382:Address Book 2353: 2346: 2339: 2334:Purble Place 2332: 2325: 2318: 2311: 2304: 2299:Chess Titans 2297: 2290: 2277:Discontinued 2265: 2258: 1957:Ntoskrnl.exe 1865:Boot Manager 1857:Architecture 1747:Group Policy 1639:File systems 1539:Saved search 1446:Sticky Notes 1411:Quick Assist 1339:Media Player 1309:Feedback Hub 1304:Fax and Scan 1199:Task Manager 1129:Event Viewer 1109:Disk Cleanup 958:. Retrieved 948: 927: 919: 907:. Retrieved 903:the original 893: 882:. Retrieved 878: 869: 857:. Retrieved 847: 835:. Retrieved 825: 813:. Retrieved 803: 792:. Retrieved 788: 779: 772: 766: 761: 750:. Retrieved 747:seclists.org 746: 737: 726:. Retrieved 722: 713: 706: 701: 696: 684:. Retrieved 679: 670: 658:. Retrieved 648: 609:command-line 591: 430: 418: 410: 403: 397: 390: 360: 353: 346: 338: 273:Windows 2000 216:Description 174: 160:proprietary 153: 152: 97:Developer(s) 2793:Online help 2732:Minesweeper 2701:Spun off to 2522:MSN Dial-up 2517:Movie Maker 2422:Diagnostics 2372:ActiveMovie 2114:COMMAND.COM 1992:Shadow Copy 1847:Server Core 1687:Mount Point 1614:Shadow Copy 1209:Windows Ink 811:. Microsoft 682:. Microsoft 601:Free Pascal 573:SourceForge 552:CHM to EPUB 483:CHMate Neue 477:SourceForge 467:SourceForge 441:SourceForge 421:Free Pascal 399:Sumatra PDF 349:hyperlinked 343:File format 162:online help 146:Help system 120:Predecessor 2777:Categories 2712:DVD Player 2527:NetMeeting 2427:DriveSpace 2292:3D Pinball 1792:SharePoint 1556:Start menu 1401:Phone Link 1264:Calculator 1219:PowerShell 1080:Management 960:1 February 884:2022-01-05 794:2020-10-29 752:2020-10-29 728:2020-10-29 686:10 January 641:References 577:DisplayCHM 527:Mac OS X: 519:Chm Reader 515:KingReader 459:kchmviewer 449:chmviewkit 308:Windows XP 289:Windows Me 258:Windows 98 193:Windows 11 185:Windows 98 2507:Messenger 2502:Messaging 2432:DVD Maker 2402:CD Player 2397:CardSpace 2348:Solitaire 2048:BitLocker 2043:AppLocker 1677:Hard link 1566:Task View 1544:Namespace 1514:ClearType 1334:Messaging 1319:Magnifier 1284:Clipchamp 1259:3D Viewer 837:15 August 583:libmspack 513:Android: 250:February 228:Microsoft 221:February 158:Microsoft 130:Successor 102:Microsoft 53:Microsoft 2751:Category 2628:MS-DOS 7 2613:ScanDisk 2532:NTBackup 2412:Contacts 2392:Cardfile 2327:Hold 'Em 2306:FreeCell 2152:VBScript 2063:Defender 2031:Security 2017:Winlogon 1972:Registry 1586:Services 1519:Explorer 1504:AutoPlay 1391:Paint 3D 1376:OneDrive 1366:Narrator 1314:Get Help 1269:Calendar 1164:Settings 1134:IExpress 909:17 March 770:versions 619:See also 612:compiler 569:arCHMage 555:Archived 548:ArCHMock 532:Archived 505:Archived 490:Archived 416:format. 414:INI file 323:January 296:October 265:January 2727:Mahjong 2648:Interix 2582:WinHelp 2482:Journal 2472:Imaging 2320:InkBall 2206:DirectX 2169:ActiveX 2157:JScript 1870:Console 1842:Hyper-V 1737:Domains 1561:Taskbar 1534:IFilter 1509:AutoRun 1471:WordPad 1466:Weather 1381:OneNote 1371:Notepad 1294:Cortana 1169:Sysprep 859:22 July 815:6 March 660:7 March 625:WinHelp 605:doxygen 603:(for a 581:Amiga: 540:ChmPlus 523:iReader 502:ReadCHM 498:ChmPlus 473:CHMPane 380:Unicode 235:August 203:History 2760:  2749:  2722:Hover! 2596:Others 2577:Travel 2572:Syskey 2355:Tinker 2313:Hearts 2241:WinUSB 2226:WinAPI 2211:Native 2022:WinUSB 1947:MinWin 1724:Server 1524:Search 1436:Sports 1406:Photos 1396:People 1274:Camera 936:  587:Aminet 471:Java: 455:Okular 445:CHMsee 437:GnoCHM 315:March 210:Month 2688:WinFS 2587:Write 2284:Games 2251:Games 2124:WoW64 1952:NTLDR 1942:LSASS 1875:CSRSS 1682:links 1657:exFAT 1486:Shell 1451:Store 1441:Start 1431:Skype 1386:Paint 1361:Money 1289:Clock 1236:WinRE 1144:Netsh 1082:tools 1071:Games 544:CHMox 481:iOS: 435:GTK: 406:7-Zip 356:ASCII 326:2003 299:2001 280:July 268:2000 253:1998 238:1997 224:1996 213:Year 156:is a 2762:List 2643:HPFS 2407:Chat 2365:Apps 2267:Surf 2216:.NET 2184:DCOM 2012:WHEA 2007:USER 1997:SMSS 1787:WSUS 1767:MSMQ 1709:ReFS 1672:NTFS 1647:CDFS 1604:CLFS 1599:BITS 1499:Aero 1476:Xbox 1456:Tips 1344:2022 1329:Maps 1324:Mail 1299:Edge 1251:Apps 1046:APIs 962:2018 934:ISBN 911:2012 861:2014 839:2012 817:2012 688:2017 662:2012 529:iChm 487:iChm 463:KCHM 453:Qt: 419:The 391:The 306:and 287:and 166:HTML 141:Type 83:.lit 73:1.4 62:1997 31:.chm 2542:Pay 2442:Fax 2189:OLE 2164:COM 2147:WSH 2134:API 1895:DLL 1890:EXE 1802:PWS 1782:IIS 1742:DNS 1714:UDF 1702:EFS 1697:TxF 1667:FAT 1662:IFS 1652:DFS 1241:WMI 585:on 571:on 475:on 465:on 439:on 367:LZX 2779:: 1059:NT 1054:9x 877:. 787:. 745:. 721:. 678:. 575:, 521:, 517:, 500:, 496:, 485:, 461:, 457:, 447:, 443:, 310:. 291:. 275:. 260:. 245:. 172:. 1027:e 1020:t 1013:v 1000:) 964:. 942:. 913:. 887:. 863:. 841:. 819:. 797:. 755:. 731:. 690:. 664:. 599:/ 382:. 369:)

Index

Filename extension
Internet media type
Microsoft
Latest release
.lit
Developer(s)
Microsoft
Operating system
Microsoft Windows
Microsoft WinHelp
Microsoft Help 2
Type
Help system
Microsoft
online help
HTML
software documentation
Microsoft WinHelp
Windows 95 OSR 2.5
Windows 98
Windows NT 4.0
Windows 11
reverse-engineered
Microsoft
Internet Explorer 4
Windows 98
Windows 2000
Internet Explorer 5.5
Windows Me
Internet Explorer 6

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