It's an a.out executable, most current Linux distributions are ELF based,
you need some additional libraries and kernel support to run a.out
binaries (unless you are running an older distribution)
In this case it's probably not worth the effort, just get newer
version of rvplayer from:
http://www.real.com/products/player/50player/50download.html?src=hp_butn,990629home_2,pod0520&lang=en
There is a bit of info about QMAGIC a.out file at (from 1994):
http://yebisu.ics.es.osaka-u.ac.jp/linux/GCC-FAQ.html#(53)
/Simon