Just saw this Brendan, that's awesome, I'm really glad you like the name. If it makes any difference, I started out the list of name suggestions with extensions I liked and then worked backwards to justify the acronym, which is why it's a bit wonky in terms of grammar. In fact ".mox" literally came to me as a "futuristic .mov file" so I'm glad you picked up on that! I hope you go with it, that was probably my favorite. I think it can be said either way...
-TGÂ