The Sony plug-in is to read XDcam, correct? I think the original post is to create a material exchange format file for Final Cut (or any other NLE) to read. I believe the problem is with the way the Mac is defaulting to Quicktime X. Either the Mac doesn’t have Quicktime 7 installed (which is critical for Final Cut to work properly), or Quicktime X is set as the default media app in the Mac.
Final Cut Studio comes with the Pro version of Quicktime 7. You would insert the install disc for FCS and look under optional installs for Quicktime 7. Install it , and make it the default media player for everything.
The Mac should be able to read the mxf file unless the resolution is something very non standard
Dave