CB - polish letters in zip file

I have big problems with ComodoBackup 4.

I try to backup to *.zip file but while in filename is polish letter like ą, ę, ć etc CB change (in zip file) it to “?”.

Is it possible to have polish dialectic letters in zip file? How to repair that?

Comodo Backup 4 doesn’t support unicode characters (including Polish) when backing up to zip file.
We will fix this in a future release.

Thanks