Easier Way to Rename Lots of Files with Unknown Characters

[admin]

Here is working code for Visual Basic 6.0 that will unfold the diacritics using API FoldStringW.
Once this is done it is a simple matter to just remove the diacritic modifiers that are in the range 0x300 To 0x36F.
It should be easy enough to convert this to C++. ...

XY is written in VB6. And the code you showed is exactly how I'm doing it in the "Remove Diacritics (ä > a ...)" function.