unWC 

unWC is a good .exe type ebook decompiler. unWC can extract all source files from .exe ebooks which were compiled by Webcompiler.
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ChmDecompiler 

A batch decompiler for Compiled Windows HTML Help files (*.chm). ChmDecompiler can extract all/any source files in a MS .chm file or ebook easily and quickly,ChmDecompiler is also a easy-to-use .chm file viewer.
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