The plugin works great, but...

I have many songs with scandinavic characters (ä, ö, å) in directory names, file names and in song tags. Most of my songs are in ogg format. The plugin works great, but these particular scandinavic songs do not submit in last.fm. For example file:
"C:\Ultra Bra\Sinä päivänä kun synnyin\19. hauki.ogg"
... which has these tags:
Title: hauki
Artist: Ultra Bra
Album: Sinä päivänä kun synnyin
None of the songs in that directory don't submit. It can't be the song title "hauki" - it doesn't have any umlauts. But maybe the album name in the tag? Or more far fetched; maybe the directory name? I'm not even sure if this is a XMPlay problem or a plugin problem

. Maybe somebody can help me in this.
Thanks for the great work so far!