Hi, I downloaded Microsoft's Winodws 7 and installed the 64bit version. All the Canon utilities work fine, except for the RAW Codec - No 64bit support. It is possible to download a 64bit codec from a third party, but I noticed that some RAW files do have Thumbnails. Here is the scenario:
1. Codec 1.5 installed
2. Microsoft Pro Photo Tools installed http://www.microsoft.com/prophoto/default.aspx
It seems that if you browse the folder in Pro Photo 2, the thumbnails are generated. Once that is done, the folder view in Explorer always shows the Large thumbnails.
This should work for any x86 type app that opens the folder to see the content. It loads the Codec and generates the images. Only the 64bit Explorer will not trigger the Thumbnail generation.
It is a pity that Canon doesn't have a 64bit codec.