CHM file is a file with .chm extension.
CHM stands for Microsoft Compiled HTML Help. This kind of files are optimized for reading. This data format was developed by Microsoft and released in 1997. It was introduced by Microsoft for the first time with the release of Windows 98. Now, it is distributed and supported through Windows XP and Windows Vista.

There are many paid software which allow you to see CHM help files as HTML pages.
Chmlib.com authors developed the website which permits you to view help files in convenient way for free. They believe that the website they build are going to be useful for Linux, Mac and other non-Windows users which cannot view CHM files using their operating systems.

The website is continouly updated. Software developers can also send their help file to authors of the website to have it converted into HTML format and added to the website.
Chmlib.com file stores files in convenient format and allows you to read them even if you work under the non-windows operating systems.

In 2002, Microsoft announced some security risks related with the .CHM data format, as well as several security bulletins and patches. But reading the CHM file using chmlib.com in HTML format is completely safe.

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