The link you posted doesn't work for me Geoff so you may well be meaning the codecs package that I'll be linking to here.
@ Dagwood. The codecs package linked to here
http://www.fastpictureviewer.com/codecs/ used to be donation ware but other than me it appears few used to actually do any donating.

The writers have now been forced to provide these at cost ( approx 9 GBP) which to my way of thinking is quite reasonable. I'm sure there may well be some free packages out there but installing codecs can be somewhat hazardous in my experience as they are installed behind the scenes so to speak in that you don't actually get to see them.......only the results.
The problem is that various applications install their own set of codecs (Picasa being one such application and Nero another) and one set can interfere with another. I discovered this for myself when first installing freely available codecs to view raw files in Windows 7 only to later find that my burner no longer worked with several applications that needed access to it. Since uninstalling these and subsequently installing the package linked to above all is now working fine and all applications requiring access to the burner (Nero, Picasa, Sony Movie Studio and Windows Live Movie Maker amongst others work as intended. So in my book paying out a few pounds would be well worth it.
Edit: your link appears to be now working Geoff........strange.........and we've both linked to the same package LOL.