Vista - Image metadata format

After discovering that Windows Photo Gallery (WPG) supports image tags, I
tried viewing the metadata in some of the images I have created in Photoshop.
The data didn't show up at all in WPG and only the camera data appeared in
Windows Explorer. This is unfortunate because I have a LOT of images tagged
with Adobe XMP metadata. Is there a way to get XMP/IPTC metadata to show up
in WPG? Do I need to convert this data to another format? Is that even
possible? Thanks for your help.