Here is a new version of Mobi_Unpack (experimental v2) which has all known bug fixes in place.
Its primary new feature is a more robust GUI interface (Mobi_Unpack.pyw) that should better support international users on Windows with improved full unicode support for all file paths and file names.
This should be considered beta level software. I would really appreciate hearing back about any successes or failures. If it works well this version should become Mobi_Unpack_v061 final.