Hello List : I am just about ready to move all of our users from Pvx 4.23 (using 5.01 binary) on SCO Openserver 5.0.7 over to Pvx 9.10 on Red Hat Enterprise Linux 5.3. All of the testing that I have run so far has worked rather nicely. I was wondering though, if there was any advantage to creating all of the files in 9.10 and then copying the Data Dictionaries and then the data into those "new" files? I was simply going to restore the data files as they were. Are there any differences in the file headers between 4.23 and 9.10? Thanks, Bill.