Windows XP Hey,  Lately, for some reason, I'm unable to rename photos.  This was very rarely if ever a problem before; but now, I cannot rename any.  I searched Microsoft and Google, and haven't found anything. When I right click on a thumbnailed photo, then rename, then try to rename and enter, I get a message - "If you change a file extension, the file may become unusable.  Are you sure you want to change it?"  If I click yes, the photo's done and becomes unusable.  Like I said before, this is new. Any thoughts?