0xBF is exactly what I need, it is polish character 'Ż' in CP 1250. In CP 1252 it is '¿'. What I get is 0x3F, which is '?'.
I have tried English Windows and finally it worked correctly. So I guess that you use internally CP 1252 (or maybe default LC_ALL "C") and probably you use some function to write text file, which does code page translation. No problem, when system use CP 1252 too, but doesn't work for my Windows with CP 1250.
Other minor problem is that you don't use CP from TYP file in "Visualization" window. This could be connected to write problem, since any editing in this window damages national characters too.
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