Is it possible to add an item to the right-click context menu of a Mac OS programmatically?

Question

I have a program that works with a variety of files on both the Windows and Mac OS.

I would like to give the user the option of adding a new option to their right click/control click context menu to the effect of "Compress with [Name of App]".

I know this is quite possible in Windows with modifications to the registry, but is there a way to achieve this for the Mac? Perhaps using C++ or objective C?

Even simply knowing if it is at all possible would be great so I don't spend a long while barking up a tree that doesn't exist!

Thanks!

Answer 1

well, can't say how, but I know it is possible as quite a few 3rd party programs do this on my mac.

Answer 2

Here's a guide: Writing Contextual Menu Plugins for OS X, part 1

Answer 3

Yes, you can. You need to make a contextual menu plugin. Apple has contextual menu plugin sample code on its developer site.