1. If you expect that you can play a file that can not be played on QuicktimePlayer, you might be disappointed.
2. The purpose of this app is to provide features not to QuicktimePlayer.
3. You can zoom in/out without changing the window size.
4. You can seek by slider or button of the fixed value.
5. You can control the speed of forwards playback and backwards playback.
PcMac Store 
