For anyone that wants to use tags without turning their phone on and without rooting it you could just shake it.
Use a Tasker profile based on a shake, then a Secure Settings action to wake the phone, then the tag to unlock.
Might suit some.
Sorry I'm confused. MX is a video player. WMA is an audio format. As far as I can tell MX does not play any audio files. Certainly I cant get it to find them let along play them.