@richUK
Actually its more to do with this:
Format : Digital Video
Not necessarily, here’s “2” examples of the “Format” displaying “A Compatible Format”
Format :xvid
http://community.wdc.com/t5/WD-TV-Mini/Trouble-playing-avi-files/m-p/58368
Format :MPEG-4 Visual
http://forum.wdlxtv.com/viewtopic.php?f=&t=2749
In both cases, it’s the Format profile : OpenDML which is the cause of in-compatibility with WD Players.