I am throwing this question out into cyberspace, with little hope, as it looks like the IMP format has been mostly abandoned.
A few titles in the library that I want are only in IMP format. So I tried this converter, but with mixed results.
I "installed" IMP GUI Converter v 1.36 as instructed --- mscott161 stated that all that is required is the ConvertIMPGUI executable and the ICSharpCode.SharpZipLib DLL. I launched the GUI and loaded a book into it. I CAN get the text extraction, but the HTML tool on the menu is grayed out / disabled.
The text extraction pulled out the text well enough, but apparently cannot deal with unicode characters. Lots of question marks/null glyphs for curly quotes, mdashes, diacritics, etc. I don't know if the HTML extraction would have better results, because it is disabled and not usable.
Any suggestions how to get the HTML extraction working?