Ok, here's another attempt which should address both points you raised, Serhiy.  I don't have an East-Asian Windows install to test on (and wouldn't be able to read anything to do the test, anyway!), but I did test with a prefix containing East-Asian characters on US-English Windows.  Command Prompt had issues and MSVC choked completely, so I could not run with the debugger for that test, but Python and Tkinter seemed to work fine.