After some research i did with Zonked of help.script at quakenet i think this is a bug.
http://www.mircscripts.org/comments.php?cid=2331 This script gave me at SOME files the error:
* /splay: unable to play 'C:\Mijn documenten\muziek\WWE - The Anthology\CD1\01-cd1-unknown-world_wrestling_federation_signature-wcr.mp3' (line 1295, mp3.mrc)
There aint no character problem sinds i got it with some shorter files as well.
http://nomorepasting.com/paste.php?pasteID=41607 is the part wich gave me the error.
I hearth from Zonked it might be a problem of ME and Lower and if it is, i hope you can fix this.
P.S: Those are all .mp3 format at the same folder.