I doubt they are corrupt. I never used Vegas 9, but I experienced problems like you describe with Vegas Pro 8.1 which was the 64bit release of version 8. I never could use it for Fraps. If you are using the 64bit version you might see if you still have the problem with 32bit Vegas 9.
What release of 9 are you using (a,b,c,d, or e)? 9.0d and e as well as Vegas 10 have problems with importing fraps files. On a modern PC they should import quickly. If you are using version d or e or ever update to them and need to work with fraps recordings you should read my post in this thread: https://forums.creativecow.net/thread/24/919876
I just started using Vegas 10 in 64bit and I don’t think the problem you describe happens anymore but maybe the issue was still there when 9 was first released. If you are using an old version of Vegas 9 and want to use the 64bit version you may want to try installing the latest update. But again if you do that you will need to swap a file to work with Fraps recordings as described in the thread I linked to.