In the XMMS playlist, the default font for GTK1 does not display correctly Cyrillic file names. A commonly used encoding for Cyrillic text is CP1251. To select a font that supports it, go to
Preferences > Fonts > Playlist.
Clicking the Browse button will show the Select playlist font window. Go to the Filter tab and look for the Charset called
Now go to the Font tab to see what fonts have been filtered out. The only one that supports this character set is Terminus:
Select your preferred style and size and click OK. That’s it.