What about a script in the new version that sorts the files by their id (ascending), replaces all of the existing files id's, and updates the auto-enter serial number to pick up where it left off ? The replace command can be done without dialog, and the script could run on startup of the new version. The only thing I'm uncertain of is how you could make the script run only once, for the initial update. ... Be sure to opt for "auto update serial #" under the "specify" button, and choose the id field to replace. Provided that your users haven't deleted any files, the sort,replace,and serial# update could theoretically work , as the present id's would be replaced by the same ones, and any additions would pick up where the user left off. However, if there are any files deleted- the replace command would give many of the files new id's and knock things out of sync. If the id itself is not crucial, but the names and other info are - it should be no trouble. Whatever the case - Use caution if you decide to go this route!