I do get an error"com.google.bitcoin.store. unreadablewalletException could not read wallet".
done...
You got that error when you attempted to use my utility? I'm not sure how you got that from my Python script... when that is a java based error... hmmmm

You downloaded this:
https://github.com/HardCorePawn/extract_mbc_keys/raw/master/extract_mbc_keys.zipExtracted it... ran the .exe file and selected your wallet file... and you got that error?
No. I get the error when I try to upload the backup file back in to the wallet. I will try your utility today.