I have a customer that uses Vegas Pro 9 software and I need to know if his software will drag and drop MOV files from the hardrive directly into the software?
Thanks in Advance

I've done this with MOV files as far back as Vegas 6 so Pro 9 shouldn't have any problems.
I say shouldn't because, just like AVI, MOV is a wrapper that covers a multitude of file types that may not work within Vegas.
Have your customer try a small sample just to be sure.