I've noticed that when shooting RAW format with a C5050 there are two files saved. One is the ORF file which is the picture - the other has the THM extention. Checking with Google I think it's some kind of thumbnail file - but I'm not completely sure. Does anyone know exactly what it is - and more to the point - is there any reason to keep it? ORF files open fine in Photoshop without it so I'm really not sure what it's for.