Does Final Cut Express Accept Raw M2TS Files That Are Not From Cameras?

I have several raw M2TS video files that I obtained using HD PVR and I would like to edit them on Final Cut Express. I understand that you can import M2TS files directly from camcorders and that FCE will convert them directly from there. But what if the M2TS files come from other source? Can Final Cut Express still import these files that are not from camcorders or do I have to convert them first using third party software?