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Microsoft warns Vista users not to add metadata to Canon RAW .TIF files  
Monday, February 26, 2007 | by Rob Galbraith
Microsoft is cautioning Windows Vista users not to tag or otherwise add metadata to Canon EOS-1D and EOS-1Ds RAW .TIF files unless the (as-yet-unreleased) Canon RAW codec for Vista is installed:
Alert: Issue with Canon 1D and 1Ds RAW files on Windows Vista
There is an issue with Canon RAW files that end in .TIF (which are limited to 1D & 1Ds cameras) on Windows Vista systems that do not have the Canon RAW codec. If a user adds metadata to one of these files, using the Windows Photo Gallery or the Windows Explorer, the file will be corrupted. This is a result of the Windows Imaging Component API not understanding the difference between a legitimate TIFF file, and a Canon RAW file with a .TIF suffix.

Microsoft and Canon have identified the issue and are testing a patch to address the problem. We will provide download information once the patch is released.

A post on the Microsoft Photography Blog has a bit more information on the problem, and notes that Microsoft Photo Info will add metadata correctly to these files even when the upcoming Canon RAW codec isn't present.
Thanks to Ian Musk for bringing this to our attention.
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