The VideoLAN Forums

I did however do some installing/uninstalling of older/newer version of VLC.

Could that be it?

I don't think it is a VLC problem. Uptill a few months ago I could play some files using VLC player. But I just reinstalled everything on my new machine and BOOM! 30% of my files (all that I could play on VLC before) started to give me the mlp file error. I have two copies of the same file one works...