Opening .sitx files

[Mervyn & Giuliana Bond]

Microsoft have a Windows Media application for Max OS X (I think 10.1 
upward).  My 10.2.8 was in the range.
One of my sons asked me to download the application so that I could 
view some of his Windows movies.
Downloaded the .bin file and Stuffit opened it to produce a  .sitx 
but I could go no further.
For a similar situation in the past I thought I removed the x and 
that it was then available.  Not today.
Suggestions appreciated.
Merv
--
"Science teaches that we must see in order to believe, but we must 
also believe in order to see."