"Martin Racette" <rat7_2001@hotmail.com> wrote in
news:7D3FA25B-E052-4E3C-81C2-DC91DF05E94D@microsoft.com:

> Is there a way to play them without installing anything, I mean I
> already have Windows Media Player, could there just be a codec for it

Wouldn't installing a codec be installing something?

The official answer from Microsoft is here:
http://support.microsoft.com/kb/316992