Other things a bug advocate would do (maybe you already did) – find the worst thing that can happen because of the bogus menu items, e.g., do you get an error when you click one? What if you happen to have a file with that name already saved in a different app? Also, can you clear the list of recent files, making the problem occur not just when the app is first installed?

And one more thing – once I’ve made my case as effectively as I can, I don’t sweat it any more. Deferring or ignoring bugs is a business decision, and the tester rarely has access to all of the necessary inputs for making that decision (the importance of hitting a market window, etc.).