At one time I had the English version of the ADX/CPK converter known as adxplay.

All that I can remember is that it had a different filename than the Japanese version (it wasn't adxplay.exe).

Can anyone help me out?
Hmmm... that's not it. I could have sworn that I had a version that was in english. Now that I've tried both adxplay and cinepak... and they're both in Japanese... maybe it was all a hallucination? :B