CHM – Microsoft Compressed HTML Help – is a proprietary format for online help files, developed by Microsoft. Viewing CHM files using other operating systems is sometimes a little bit difficult.
Recently a CHM plug-in appeared for firefox which should be some help.
Sometimes it is still necessary to convert CHM files into other formats. While there are quite a lot of applications which could do that easily on Windows, it is still tricky for non-Windows systems.
e.g. for Mac OS X or other UNIX based OS
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