When you use a third-party tool to open a picture that was previously edited in Windows Photo Gallery, some metadata fields are duplicated, dropped, or corrupted
In Windows Photo Gallery, you add some metadata to a picture file. When you open this picture in a third-party tool, some metadata fields for the picture file may be duplicated, dropped, or corrupted.
This issue occurs in Windows XP, in Windows Vista, and in Windows Server 2008.
For example, you open and save a .jpg picture in Windows Photo Gallery, and then you embed some metadata into the picture by using a third-party application. When you open this picture in Adobe Photoshop, you receive an error.
In this example, if you open the .jpg file in a hexadecimal editor, you see duplicated XMP metadata tags. One metadata tag is set to xmp:xmpmeta and the other one is set to x:xmpmeta.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB946666.