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If the JPEGs still have XMP metadata inside them (i.e. you did not strip them out using "save for web", etc.), you can still see the conversion settings in the file info dialog in Photoshop CS3, in the advanced sub-panel.
Is it possible to extract the XMP metadata from DNG, JPEG, or TIFF files and save them in .xmp sidecar files? If so, how?
And if an image file has both internal XMP metadata *and* a .xmp sidecar file and the internal and external XMP data don't match, which will take precedence?
For the case of DNG files with both internal XMP and a sidecar file, Camera Raw picks the file with the newer OS modification date/time.
Adobe does not support sidecar XMP files for JPEG or TIFF files.
It is fairly trivial to write computer programs to exact XMP from files, so yes, it is "possible". You can save the XMP out of any opened file in Photoshop CS3's get info dialog in advanced mode (see the save button at the bottom).