I keeeep getting an error when I try to play the movie saying QT cant open or installl plug in how do I get all my movies that says this to play in QT?

Question

How do I get the movie to play when it's saying QT can't play because of files not support but they have the mov extension

Answer 1

How do I get the movie to play when it's saying QT can't play because of files not support but they have the mov extension
The MOV file extension simply refers to the file container. In this case, the MOV file container is the "generic" QT container that may contain any valid audio/video compression combination compatible/support on the system that created the file. For instance, if the movie was created on a system with FCP installed on it, that originator of the file may have used a compression codec not available on your system if you do not also have this application installed. The same holds for similar codecs like MPEG-2, DivX, XviD, WMV, etc. In some cases the codec may even be a legacy codec which will run in QT 7 but not the QT X player app.
In short, your best approach is to determine what audio and vide codecs are involved and then see if they are supported on your system. You can normally do this by checking the Finder Info window for the file or opening it in an alternative media player that supports playback and checking that app's media info window. For instance, the VLC media player supplies its own codecs and therefore does not rely on your system's QT component configuration.