I downloaded version 5.52 and ran the same command line as yesterday and it worked perfectly. I'm beginning to see that ExifTool is a very powerful and useful tool for making Exif edits to raw files. May be some day you'll have time to put an interface around it so that folk like me find it a lot easier to use. Thanks again for your time and help, especially the very quick updates that resolved the issues I was having. BTW: the date change that ABFA was seeing for CRW doesn't occur for CR2's so it looks like the ABFA code writer is on the right track with that format.