Downloading EX_M4S2 2.0 for Mac from our website was free. The software lies within Audio & Video Tools, more precisely General.
From the developer:
What's EX_M4S2? EX_M4S2 is a QuickTime component to play the MPEG-4 movies taken by CASIO EXILIM. As codec FFmpeg(libavcodec) included in MPlayer is used. Why do you recommend EX_M4S2? On Mac OS X, in default, we can't play the MPEG-4 movies taken by CASIO EXILIM. If you install EX_M4S2, you can play EXILIM MPEG-4 movies with QuickTime Player. And you can import EXILIM MPEG-4 movies into iPhoto 5. What kind of MPEG-4 movies can EX_M4S2 play?