Xmp files - are they safe to delete

after I open a RAW file there is always a xmp file saved.  If I made changes to the RAW file, will there be any effects on my photos if I delete all of the xmp files.  I know that they are there to show the file information, but I just want to make sure that nothing will go wrong with my edited photos if I delete the xmp files.

The XMP files contain information about the last conversion you did on a particular raw file.  If you delete it your conversion parameters will revert to defaults next time you open the raw file, instead of Camera Raw using the last conversion parameters.
Go into Edit - Preferences - Camera Raw... and you'll see that you could choose to save the conversion parameters in a central database if you don't like the sidecar XMP files showing up.  If you DO choose the central database, consider upping the max size from the default of 1 GB.
-Noel

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