976 Views 3 Replies Latest reply: Jan 16, 2010 8:13 AM by QuickTimeKirk
iTunes is the "default" Open With application for the .m4v file extension. QuickTime X is the default for the .mov file extension.
Other (older) file extensions like .avi would use QuickTime Player version 7.6.3.
You can change the default Open With on individual files with a simple Control click on the icon in the Finder. That "change" is only for "that" file.