Hi
I haven't loaded any codec packages that didn't come with Windows and I haven't found anything that Media Player won't play.
I think that the .mov codec may have been installed by some software I installed like Adobe Premiere but I'm not sure.
But I can run AVI, MOV, Mpg, WMV, DVD, I can't really remember anything I've tried to run that didn't.
And I use it for everything. I don't have any other player except for QuickTime which I try and avoid.
Mike