Convert a Quicken File To QuickBooks is only feasible in one direction. Quicken can no longer access the data once it has been completed. A backup of your Quicken data should be made before starting any conversions. If not, a duplicate copy of your Quicken data should be transformed. The fact that only Quicken for Windows files can be converted by QuickBooks should be noted. It is simple to start fresh instead of using this method because of the difficulties that arise while doing so.