There is a problem with polish letters in help files. My custom excel functions contain polish letters like "Ą", "Ż", "Ć" and they are missed in index.htm file which contains listed functions.
For example generated index.htm file should contain:
MIĄŻSZOŚĆ_DREWNA

Instead of that index.htm contains:
MISZO_DREWNA

I have utf-8 set in my files and in notepad. I think that polish letters are removed during project building. Any ideas if I can manage with that?