Sorry, I should have said that I knew about the opportunity to change the filename. Most of the time, I'm opening an MGU file, editing it, saving it under the same filename and rendering the track to WAV, which is given the same base filename with _Render.WAV appended.

The problem arises when I edit a file and save it with a different filename before exporting to WAV. It's easy to forget that the filename has been changed, and forget to change the filename, and my argument is that the base filename of the file currently open should be used, not the filename of the file opened earlier.