QuickTime won't load .mov?

I have a number of .mov files of different ages from different sources. Ever since I upgraded to Mavericks (ver 10.9), none will open with QuickTime (ver 10.3). Double clicking on them gets me a small window that says "converting" with a progress bar. Then I get a dialog box "QuickTime Player can't open filename.mov", with an "OK" and a "Tell Me More" button. "Tell Me More" just sends me to the page that tells me the files QuickTime will load.
Looking at the Get Info > More Info, some of these movies have a VP6F, MPEG Layer 3 codec; some have H264, AAC codecs.
I tried opening them with VLC (ver 2.1.2). Some will play; with others I get audio only.
Basically, you have multiple problems. The first is the fact that QT X v10.3 only supports a very limited set of compression formats compared to previous versions of QT X. The second appears to be the loss of certain support codecs—the access for which was orphaned during the Mavericks upgrade or which were deleted as part of the upgrade process. In addition, since you indicate that some of the problem files are H.264/AAC MOV files, it would appear that they may be hybrid or non-standard encodings since standard encodings should automatically open directly in QT X v10.3 and not trigger the MovieModernizer/Convert routines.
You have two primary options here. The first would be to determine what support package was lost and re-install or reconnect access to it allowing QT X v10.3 to auto-convert the files or you can re-establish the required support access and use the free QT 7 Player v7.6.6 to play the files without conversion using the 32-bit QT structure still embedded in the Mavericks OS.

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