Can I play AVi's on my PC through the xbox 360 without issue as long as it
play fine on my PC running Vista Ultimate

No, the Xbox 360 supports a limited subset of AVI codecs. There's a Video
Playback FAQ on the subject on the Xbox site. What happens when you try?
What codec does the file in question use?

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Speaking for myself only.
See [url]http://zachd.com/pss/pss.html[/url] for some helpful WMP info.
This posting is provided "AS IS" with no warranties, and confers no rights.
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"Bullet" <Bullet@discussions.microsoft.com> wrote in message
news:45B293EE-2B02-4C28-8EEE-DD7289741BE6@microsoft.com...[color=blue]
> Can I play AVi's on my PC through the xbox 360 without issue as long as it
> play fine on my PC running Vista Ultimate[/color]