The problem is quicktime is not 64 bit compatible, on any platform. Is there a reason you need to build it for 64 bit? We did move over 0.9.0 to support 64 bit pretty much across the board but as for compatibility of addons that's more the maintainers responsibility than ours (imagine the legacy issues if every addon that hasnt been updated in years still had to work...)
Have you tried ofxWMFPlayer? If you are just trying to playback HD videos people have had pretty decent success but certain functionality does not work (like playing a video backwards)
I have the most up to date branch - https://github.com/DomAmato/ofxWMFVideoPlayer