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

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?