Previous answer was a bit short as no broadband at time.
You have 2 choices, either remux the particular files with VIRTUALDUB, or try another codec setup.
I take it all these file extensions are .avi, so in theory they could be any format, Never found FFDShow works with all my files, some Nero .mp4 (why ? plays majority of them and ripped myself) do not play.
Must admit to being a bit lazy on finding the full answer to this one, most people here condemn codec packs, which i fully understand as have had quite a few codec related problems in the past, that's how i stumbled across Filmerit.
Anyway to solve my various issues i installed
Vista Codeck Pack which does not associate filetypes etc.
Everything inside this package will be instantly recognisable to people, FFDShow, xvid, AC3 etc, but it is the actual configuration that has been done by shark007 for you that makes this a great feature.
Suggest you try both the codec pack and Filmerit to see if this resolves the issue (uninstall old codecs first, reboot, test with Filmerit, and if no errors install VCP, reboot).
Hope above helps.