The XMP sidecar files are generated when you use ACR (Camera Raw) to correct your files. There's not made in the camera. LR converts to DNG, and the metadata that is normally stored in XMP files is in the actual DNG file.
Thanks for your response but i still don't get it,
In the past when ever i down load images from the camera i had xmp files with them, weather i was using lightroom or not, now i don't. i have not gone via the dng route.
While writing this i had another idea!
i have found that igthroom had created a rather odd file structure for the last two days, these were the images in question. so i have down loaded them to the HD and imported them from there (having already placed them in the file i wanted) and now they have amp files all is fine in the world.
i am now going to delete the files which Lr created, (they too now have xmp) This is all very odd!
i hope you are less confused then me after all this waffle!
That's interesting. What type of camera do you have that creates these sidecar files?