nah, it's ok, I wouldn't know what it is if I hadn't got this player. All I know is that it is a really old school video format. I used to have one for m old windows OS, but I remember you had to convert it from m4v to flv to mtv, or something like that, I haven't done it in a while, as it takes so long...
Anyway, I cannot offer anything in the way of suitable answers (not even from a Windows/Linux perspective), however a Google search for m4v to mtv osx brings up many options. Tbh, from looking at the results I wouldn't trust any of them, but they seem to offer what you are looking for. You may feel brave and have a try of one of them, but you do so at your own risk!
Nothing shows up of value at Apple.com. Don't throw that Windows license away just yet!