I believe QuickTime 7 is all that can be used, so it's 32 bit only for MOV files that PP can't see on its own.
MXF is a much better container format, as it is just a container, unlike QuickTime which is a full multimedia framework. MXF requires no installation (and hence never needs updating), doesn't launch a process when used so 32 and 64 bit mater not, it has no bugs or odd quirks - it just holds the video, audio and metadata.
The down side is that because it's use is largely limited to professional circles, very few media players will let you watch an MXF file. The only one I've found is VLC, and even that is fussy about which codec is inside the MXF.
Thanks. I believe this has been resolved now with the last patch?
From Amooney, October 2013 release of CC :
New native file format support for Cinema DNG, Sony RAW, Phantom Cine, improved MJPG from Canon 1DC, Sony XAVC Long GOP, Panasonic AVC Ultra (Long GOP), 64 bit ProRes decoding (Mac OS X 10.8 or higher only)