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14 Apr 2012  

Microsoft Windows 7 Home Premium 64-bit 7600

as its an image you want to show in the folder and not actually change the folder icon to a different one.
then rename the image inside the folder to "folder", it will show then ,or at least it should, this is only a workaround im afraid and doesnt really answer your problem, i wonder if rebuilding the icons cache may help

Icon Cache - Rebuild - Windows 7 Forums
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