If I understood this thread: alt00N voicepack error - #6 by profezzorn correctly, you can, now, also have an “mnum” subfolder in your font folder where you put all the voicepack sound files.
You would need the latest OS8.x from Github master.
But this would keep your font folder “cleaner”.
Edit: I crossed out the incorrect sections because this is not how it works. Sorry for the miss-information.