When I import MOV files the audio tracks aren't appearing in the timeline. When I play the files in Windows Explorer they work fine so I'm not sure what the issue is?

Does Sony Vegas Movie Studio HD 9.0 not like MOV and will I have to convert them to AVI or MPG? I've been using this program for some time with no programs but usually don't work with MOV. Would seem like a normal format to be supported.

Any help would be appreciated.