Simple Fix to a simple issue, Make sure you have downloaded K-Lite codec pack, Google it, very easy to find and download.

Quick steps to solve this issue
1. Make sure you have your audio set too PCM not M-peg1
2. make sure you have the K-lite codec pack installed
3. Done.
Sony Vegas should now recognize your .avi, also the file sizes are still small and Sony Vegas will still compress the files.

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