I had the same wish. After digging around I downloaded and installed ActiveState's ActivePython 2.X - don't remember now what it is, just that I needed it.
There is a gui version (i.e no command line needed) called MobiUnpack.pyw, it 'opens up' mobi, but it worked only when I put mobiunpack.py and others into folder 'lib' next to pyw - just like in zip file.
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