@david-arthur, on Jun 15 2008, 08:11 PM, said in MissionComputer 4.0a7 introduces the wëap editor:
Making the custom Open Special files show up in the pop-up menu is one of five entries in my list of things that absolutely need to be done. Currently, the available sources are only the current file, and the contents of your Nova Files folder (provided that you've specified it in Preferences).
Ah, specifying my mod folder as Nova Files does the trick nicely. It even limits itself to only showing files containing the proper type of resource, apparently---nice touch.