Delphi Cookbook - Third Edition

How to do it...

Let's complete the following steps:

1. Create a new VCL application and drop two TButton components and a TMemo component. Align all the buttons as a toolbar at the top of the form and the memo to all the remaining form client area.
2. The button on the left-hand side will be used to register a file type, while the button on the right-hand side will be used to unregister the association (cleaning the registry).
3. We have to handle some features specific to Microsoft Windows, so we need some Windows-related units. Under the implementation section of the unit, write this uses clause:

uses System.Win.registry, Winapi.shlobj, System.IOUtils; 

4. In the implementation section, we need two procedures to do the real work; so just after the ...