Quick Question regarding default program openings.

Ill use an example:

If I try to open a video file (usually .mp4 or .mov) it automatically starts up my VM and opens Sony Vegas. Opening up the VM and having windows load slows my MBP down and takes a long time. How can I make it to open to VLC or iMovie by default?

Thanks. If you need more info, dont be afraid to ask by leaving a post.