Win32's open() returns only ASCII, not UTF-8, so paths with unicode will not open. Luckily there is the new sys_fopen() function in Pd 0.44:
http://pure-data.svn.sourceforge.net/viewvc/pure-data/branches/pd-extended/0.43/externals/extra/bonk~/bonk~.c?r1=16670&r2=16669&pathrev=16670
http://pure-data.svn.sourceforge.net/viewvc/pure-data/branches/pd-extended/0.43/externals/extra/bonk~/bonk~.c?r1=16671&r2=16670&pathrev=16671
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