CHM Decoder is a free tool to decode (decompile) your CHM file (Compiled Windows HTML Help) or e-book and extract all source files. The program supports command line. Using batch mode, you can convert several documents simultaneously.
Working is simple, download (465kb) and unzip the software, no installation required. Run the app by clicking on the ‘chmdecoder’ exe file and click on ‘open’ to open a chm file and then click on ‘go’ button. It immediately converts in to html file.