Simple command to create MIX files

it's on my bleed branch by accident lol and YES IM ALIVE AGAIN :D

Anyway credit to @ScottNZ for line 20. Also think that some extra validation wouldn't go astray and an extract command in the future possibly.
This swallows too much for my taste. The whole stacktrace is a little more informative than this sentence with just repeating one parameter. Just remove the try-catch block here.