Audacity converting to corrupt files

[Kranthi]

Hi, I encountered a bug in Audacity 1.3.12 Beta (Unicode)
I was trying to export a music bit i cut from a mp3 clip to convert it into m4a format.
The export went fine but the file is not properly saved/created as the file name is messed up. I can't delete that file or rename it.
If i rename it, i get the warning that the file or folder does not exist.
The file name was this : �������������������P������ whereas i named the file as lotr 2.aac

I have also asked the audacity dev team. They said that they do not have such problem in their general version of their software and they just submit their source code to the linux community.