Great app - does what it says

I am changing my review to 5 stars, because I realized that this DOES work on mkv, fly files etc. My problem before was that I hadnt installed a plugin (like Perian QT Plugin for many media types - on the MacUpdate website) so that QuickTime can handle those file types. After I installed Perian, now this Movie Thumbnails app works perfectly for all the files I have.
I am using OS X Lion 10.7.3

Med74 about Movie Thumbnails Free