How to associate a file extension to a program without making it the default program

Question

I\'m deploying a small conversion tool on some systems, and want the users to be able to run it from the right click Open with menu. But I don\'t want to change

Answer 1

In the "File Types" Windows Dialog you can click "Advanced" on your file type and there create a custom action tied to your application.

Possibly you can also find a way to do this in a programmatic manner, or at least create a .REG file with the equivalent registry options.