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A CHM help file has a ".chm" or ".CHM" extension and is often referred to as a "chum" file. The file starts with bytes "ITSF" (in ASCII), for "Info-Tech Storage Format". The format has been partially reverse engineered and there are container and internal files specifications available. There are some tools. HTML Help files are made with Help Authoring Tool s such as PowerCHM or HTML Help Workshop. Microsoft Compressed HTML Help is more complex than Microsoft WinHelp , which is based on Rich Text Format . For more information go to HTML Help Web Page on MSDN . ADVANTAGES
APPLICATIONS This format was originally intended only for encoding help files, but other uses have since been found. It is very handy for packing saved HTML pages in one compact and browsable archive and for creating compact Ebook s. Some people use it to keep personal notes, because it can organize them in an ordered hierarchical table and allows quick text searching. EXTRACTING TO HTML On Windows, a CHM file can be extracted to plain HTML with the command: hh.exe -decompile extracted filename.chm This will decompress all files embedded in ''filename.chm'' to folder ''extracted''. or by using HTML Help Workshop. On Unix systems which use apt as a packaging tool, a CHM file is extracted to plain HTML with $ sudo apt-get install chmlib-bin $ extract_chmLib tero.chm tero/ Another useful set of tools for CHM files in non-Windows environments is the CHM Tools Package . It's available as source code, and includes a program, chumdump, which extracts the HTML from a CHM file into a separate directory. It's also available via Fink on Macintosh OS X. If fink is installed on your system, you can type: $ sudo fink install chmtools At a Terminal prompt to install the package. You can then extract a CHM file with: $ chmdump chmfile.chm outdir EXTERNAL LINKS
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