QuickTime Alternative supports the following formats
MOV, MP4, QT, 3GP.
QuickTime Alternative will allow you to play QuickTime files without having to install the official QuickTime Player. All QuickTime formats (.mov .qt .3gp etc.) are supported, including streaming content and QuickTime content that is embedded in webpages.
Its quick and easy install and to make an unattended installation. There are no background processes and you can even use the player of your choice.
Best of all, its light on system resources and won't slow your PC down.