Any ideas why I can't open them, or get them to import?
Hm, just tried telling it to import more file types - such as data, "other"... and the results were slightly different (is it normal that it lists two files as imported then those same files as updated as well?):
Library now has 53535 files. Search and update took 0:37.
Imported 2 new files.
Updated 2 files that had external changes.
Failed to import 2 files.
Skipped 42 files (previously determined to be bad).
In-depth details:
Imported:
P:\Mobile upload\Rob\20140713_102945.mpo
P:\Mobile upload\Rob\20140713_142501.mpo
Updated:
P:\Mobile upload\Rob\20140713_102945.mpo
P:\Mobile upload\Rob\20140713_142501.mpo
Failed to import:
P:\Mobile upload\Rob\20140713_144208.mpo
P:\Mobile upload\Rob\20140713_145150.mpo
Skipped (previously determined to be bad):
P:\Mobile upload\Rob\20140713_103015.mpo
P:\Mobile upload\Rob\20140713_140800.mpo
P:\Mobile upload\Rob\20140713_142513.mpo
P:\Mobile upload\Rob\20140713_142739.mpo
P:\Mobile upload\Rob\20140713_142856.mpo
P:\Mobile upload\Rob\20140713_142923.mpo
P:\Mobile upload\Rob\20140713_143034.mpo
P:\Mobile upload\Rob\20140713_143234.mpo
P:\Mobile upload\Rob\20140713_143246.mpo
P:\Mobile upload\Rob\20140713_143640.mpo
P:\Mobile upload\Rob\20140713_143701.mpo
P:\Mobile upload\Rob\20140713_143706.mpo
P:\Mobile upload\Rob\20140713_143736.mpo
P:\Mobile upload\Rob\20140713_143800.mpo
P:\Mobile upload\Rob\20140713_143921.mpo
P:\Mobile upload\Rob\20140713_144144.mpo
P:\Mobile upload\Rob\20140713_144413.mpo
P:\Mobile upload\Rob\20140713_144509.mpo
P:\Mobile upload\Rob\20140713_144535.mpo
P:\Mobile upload\Rob\20140713_144804.mpo
P:\Mobile upload\Rob\20140713_144959.mpo
P:\Mobile upload\Rob\20140713_140724.mpo
P:\Mobile upload\Rob\20140713_140743.mpo
P:\Mobile upload\Rob\20140713_141039.mpo
P:\Mobile upload\Rob\20140713_141349.mpo
P:\Mobile upload\Rob\20140713_141418.mpo
P:\Mobile upload\Rob\20140713_142118.mpo
P:\Mobile upload\Rob\20140713_142124.mpo
P:\Mobile upload\Rob\20140713_142210.mpo
P:\Mobile upload\Rob\20140713_142526.mpo
P:\Mobile upload\Rob\20140713_142715.mpo
P:\Mobile upload\Rob\20140713_142827.mpo
P:\Mobile upload\Rob\20140713_142905.mpo
P:\Mobile upload\Rob\20140713_142940.mpo
P:\Mobile upload\Rob\20140713_143148.mpo
P:\Mobile upload\Rob\20140713_143203.mpo
P:\Mobile upload\Rob\20140713_143726.mpo
P:\Mobile upload\Rob\20140713_143821.mpo
P:\Mobile upload\Rob\20140713_143836.mpo
P:\Mobile upload\Rob\20140713_144150.mpo
P:\Mobile upload\Rob\20140713_144256.mpo
P:\Mobile upload\Rob\20140713_145154.mpo
All of these MPOs came from the same camera - in fact taken pretty much at the same time.
And weirdly, the two that it says it failed to import were there before - the ones it said it had previously determined to be bad where from when I tried to import all of those files earlier today!
Actually, I've noticed in File Types in options they are listed as 3D JPEG under images - maybe there is just something it's not so happy about with the contents, dunno... (certainly fits with not being able to open them from the "open media file" option).
In fact even the ones that are now imported still won't actually play in MC, and it's pulling out none of the tags. In fact, hovering over it just says "unknown album - unknown name". And the info panel says "UNKNOWN FILE TYPE - Unknown Duration"