My Canon EOS-D60 produces CRW files when the image quality is set to RAW. If, like me, your CRW image files don’t show in thumbnail view in Windows XP, you need to download the following:
This definitely supports Canon RAW files (and I believe Nikon too). As well as showing your images in Windows explorer thumbnail view, it also incorporates a viewer utility.
If for some reason the link doesn’t work, search www.microsoft.com for "RAW Thumbnailer", or for the actual setup file name RAWViewerSetup.exe