Canon has released their RAW codec for Windows Vista.  To download it:

• Visit http://www.usa.canon.com/consumer/controller?act=DownloadIndexAct
• Category = “EOS (SLR) Camera Systems”, Product Type = “Digital EOS Cameras” and then choose your camera model from the third dropdown
• Click Go
• Click the “Drivers / Software” link at the top of the page
• Choose the Canon RAW Codec  1.0
• Download and run the executable

The codec will support .CR2 RAW files, but not .CRW files.  It includes support for the following cameras:

• EOS-1Ds Mark II
• EOS-1D Mark III
• EOS-1D Mark II N
• EOS-1D Mark II
• EOS 5D
• EOS 30D
• EOS 20D
• EOS 400D DIGITAL
• EOS DIGITAL REBEL XTi
• EOS Kiss Digital X
• EOS 350D DIGITAL
• EOS DIGITAL REBEL XT
• EOS Kiss Digital N

- pixblog