How to get the filename of document that opened my app

Hope that makes sense. I'm relatively new to OS X programming and have built a small Cocoa app (not a document-based app). I've associated a file type (.myFileType) with my application. If I double-click a file with that file type, it opens my app automatically as expected. From within my app, how do I get the full pathname of the document that opened my app?

I know what you're saying. IB is made to seem easy, but when you start asking "What's this?", and "What does that do when the nib is loaded??", the pretty pictures suddenly aren't as clear as they seemed. Been there!
The File's Owner never causes the creation of an object. It's always a "proxy" (a stand-in) for an object that's created elsewhere. The actual object may be defined in another xib, or it may be created in code. In MainMenu.xib. the File's Owner is a proxy for the Application object. The Application object isn't created because of that nib, it's created by the startup code before the nib is loaded. But the "proxy" allows you to make connections to the Application object in the xib.
I know this is clear as mud so far, but it will start to make sense after you grok a few more pieces of the puzzle. A good place to start might be Anatomy of a Nib File in the +Resource Programming Guide+.
Nib proxies are actually easier to understand when building an iPhone app. In that case, the SDK makes it much easier to associate proxies with the objects they represent. The concept is still the same, but for example, bridging two iPhone xibs with a proxy only takes a couple mouse clicks in IB.
Hope that helps!
\- Ray

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