Adding a new file type in folder options through vb code or command lines in bathc files

Hello,
I need to do the following process automatically thorugh code(vb console app. or with commands in bat files)
 
MyComputer -> Tools -> Folder options -> File Types tab -> New
 
I need to add a new file type "GZ" through code(not manual process).
I came to know that we can do this by altering registry. But dont know how to do it progrmatically

Kindly help with this.
 

Thanks.