Giorgio Bani ,
I guess I have to ask if you tried to play the .avi file first on your system without using Vegas? What I mean is, awhile back I had an issue under Windows 7 and I could no longer play .avi files. I ended up having to re-install the IndeoVideo codec v5.11 and then performing this.
1. Install IndeoVideo v5.11 with Custom install options
2. Uncheck the Web Browser box and install software
3. Open a ‘command prompt’ using a rightclick, select, ‘Run as Administrtor’
4. Type: cd C:\Windows\SysWOW64 (32bit users can skip this step) – press enter
5. Type: regsvr32 ir50_32.dll – press enter
I was then able to play .avi’s fine. I’m not saying this is your issue but the above recommendations will at least tell you if you have the IndeoVideo codec on your system.
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FixitMad