To convert Quicken file to QuickBooks desktop is a one-way process. You may keep a backup before saving the data to QuickBooks because, after conversion, you will not be able to access the files through Quicken. To convert, open QB desktop and click the File tab, then select Utilities, now choose Convert. Now, from the drop-down list, click From Quicken, now navigate to the location where you have saved the Quicken file. Further, you can click the Quicken file and follow the on-screen instructions to convert Quicken files to QuickBooks.