Reinstall QuickTime X (Mavericks)

Long story short (as this page just lost a 20 minute explanation). QuickTime X crashes every time I start it because I messed with the info.plist.
I have installed QuickTime 7 and this is working fine but I would like QTX back but cannot find the download (i guess as its part of mavericks).
Is there a download of QTX or will I have to reinstall mavericks from Recovery? Am I right in thinking that I can install just the OS without data loss on the internal drive? I have a time machine backup so I can do a totally fresh install but I'd rather not as its over 700GB so just installing the OS would be good but a way of just getting QTX back would be better.
Thanks in advance .

http://www.apple.com/support/mac/app-store/contact/

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