1. You are trying to download a piece of software which is about as much use as a two legged milking stool
2. You do not have the latest, or any, edition of Stuffit Expander installed on your machine.
1. Don't download that piece of junk, go on over to Flip4Mac.com and download the Windows media reader. It works much better than Windows Media Player which is another piece of software that MS could not get right and now no longer support.
2. Head on over to http://www.stuffit.com/mac/index.html and download the FREE version of Stuffit Expander. Look carefully, there are a number of PAID versions. Download only the FREE version.
All you problems will go away at that point
I have a Mac OS X Tiger system and attempt to install windows media player for Mac, it downloads successfully. However once it has downloads the icon appears as blankpage and a .sitx file and when I attempt to open it I get a "there is no default application specified to open the document, choose application" message, I've clicked choose application but can't find one that works. Does anyone know what is wrong, and what I can do to solve it? Thanks