What are the files CDFPlayer_9.0.1_WIN & MathematicPlayer_7.0.1_WIN?

Questions
1

I am in the midst of redoing my system, and I have come across these 2 files. Does one of these files supersede the other? Should I install both? Thanks

2

CDFPlayer_9.0.1_WIN supercedes MathematicPlayer_7.0.1_WIN, both in recency and features.