Added a box where you can define your own Open- and Save dialog filters. Saving a file using the Save As function will save with the extension as defined in the selected filter. Added a Page Setup dialog and a new Printing component. This will let you set margins and print accordingly. Choose your own margin size for the Edit windows.
Text just looks better with a little margin on the left.
About dialog now checks under what OS the application is running. Polished the program a bit more. Fixes 'Invalid data type for Alternative' error.