Can new and old QT players co-exist?

I was very disappointed to find that the new QT player in Mavericks no longer plays my DV files natively. i.e. It converts them to ".mov" files on the fly before playing them.
This is a pain for me because I have TONS of DV files - most at least 500 Mb and many 10Gb or more, so they take a really long time to convert.
I do note however that after conversion the file size decreases by a factor of about 5, so I'd like to keep it around - however, I'd also like to keep an older version of QT (player) at hand and set it is the default player for .dv files just so I can quickly browse these .dv files without having to convert them.
Can older versions of QT like the one referenced here (ver 7),  http://support.apple.com/kb/DL923 , co-exist with the later, Mavericks version?
Also - lets say I did allow the new QT to convert all my .DV files to .MOV ones. Technically, will this make much difference when using them as source material in iMovie (then burning to DVD)? I did an experiment and didn't notice much difference, but at the same time I don't want to take chances with the quality of my archives or the resultant iMovie output given that the original files would have gone through an extra conversion process. Any thoughts on this appreciated...
Thanks

I was very disappointed to find that the new QT player in Mavericks no longer plays my DV files natively. i.e. It converts them to ".mov" files on the fly before playing them.
Only DV stream files (DV/DV) are converted. DV/PCM MOV files are not converted.
I do note however that after conversion the file size decreases by a factor of about 5, so I'd like to keep it around - however, I'd also like to keep an older version of QT (player) at hand and set it is the default player for .dv files just so I can quickly browse these .dv files without having to convert them.
The conversion changes the DV/DV content to H.264/AAC—newer, more efficient compression formats having lower data rates.
Can older versions of QT like the one referenced here (ver 7),  http://support.apple.com/kb/DL923 , co-exist with the later, Mavericks version?
Yes. The older QT 7 Player is stored in the "Utilities" folder. Be sure to leave it there.
Also - lets say I did allow the new QT to convert all my .DV files to .MOV ones. Technically, will this make much difference when using them as source material in iMovie (then burning to DVD)? I did an experiment and didn't notice much difference, but at the same time I don't want to take chances with the quality of my archives or the resultant iMovie output given that the original files would have gone through an extra conversion process. Any thoughts on this appreciated...
Not in the sense that both formats are edit compatible in the various QT based editing apps. However, the more times you transcode the data the more likely the data will degrade. If you let the DV stream file convert to H.264/AAC and edit it in iMovie, then iMovie will re-transcode iMovie project again to H.264/AAC and iDVD will transcode it again to muxed MPEG-2/PCM for burning to DVD—a total of three conversions. On the other hand, if you edit the files as DV, then they are only transcoded twice—once to H/264/AAC and a second time to muxed MPEG-2/PCM.

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