I am contemplating the creation of an OSX System Service as outlined here: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/SysServices/introduction.html My understanding is that I can add items to the Finder's right-click menu using this method.
The only big question mark in my mind is whether I can conditionally show my service NSMenuItem based on the item that is getting right-clicked. I don't see a way to do this in the docs, am I just missing something?
See here. You can’t run any code in advance, but you can use the NSSendFileTypes to specify an array of UTIs (which identify file types) that your service accepts.