Working with MXF files

You can download the Pro Video formats 2.0.4 from Apple to add native capabilities to preview MXF files in finder.

But if you are working with MXF file but not using FCPX, your mac might not be able to preview .mxf files from the finder unless you open them separately using VLC.

MXF files won't preview if the pro codecs are not installed on your mac

If you don't have FCPX the catch is that you need either FCPX (299$), Motion(49.99$) or Compressor (49.99$) to be able to install the Pro Video Formats.