I just joined the forum for an answer. I'm on a MacBook Pro, 2 GB RAM, running 10.5.2, and using a Canon Mark III Ds. When reading files from this camera [via Firewire card reader], it separates the CRS and JPEG even though under VIEW, the COMBINED is checked. The same issue happened on my Mac PRO with files from this camera. Files from a Mark III, and 40D are combined. I've looked through the Canon manual for the Ds, but can't find what the camera might be doing. I'm on a shoot now, and I'd like to rename both files as they are downloaded. Currently, I have to rename the CR2s and then the JPEGs separately, resetting the sequence so the have the same number.