This feature has been removed in version 3.6.5 or newer.
By following this tag; Tools>Import Data from CR Dos you can import data of DOS based window into Restaurant Billing Software for Windows. It helps you to save the data as it was in Dos. A small window will open to you in which you need to select the folder in which your DOS based data is saved up. As you select the folder a path will come there and then you need to click on import option for importation