June 06, 2013, 1:54 PM — Here's an easy way to disable the auto-restore feature in Quicktime in OS X. This will stop Quicktime from automatically opening videos from your last session.
1. Open a terminal window.
2. Type in the following command then hit Enter.
defaults write com.apple.QuickTimePlayerX NSQuitAlwaysKeepsWindows -bool false
For more, see the original article at the link below.