Select the file, and get Information (CMD-I). Then, scroll to "Open With," and find Retrospect. --steve At 3:43 PM -0500 11/2/05, whshaw wrote: >I have an eMac, using OS 10.4.3 and Retrospect Express 6.0. I downloaded v 6.1, but when I try to open it I get a note saying ""Quick Time cannot open the file "Retrospect backup update". >It is not a file that Quick Time understands (-2048)"". >Any help?