What does it specifically do?
In case there's an alternative that can do similar.
converted videos in since deprecated formats to something still playable now?
If it is that, then I'd hope ffmpeg/avconv or VLC could do the job.
some of the old codecs are copyright-encumbered.
Where there's a will there's a way!
Thanks very much BP! I'll investigate all of those.
Vice versa, Smiffy & Ant: it converts a range of extant formats into MPX, a weird, deprecated proprietary format that will play on the redundant (but rather useful) player.
Ah, you're converting to an odd format.
It's a 1.5" player that fits snugly into a cavity in a wood-turning I've made.