I downloaded Windows Media Installer (WindowsMediaInstaller.bin)
when I double-clicked on it Toast titanium opened up.
This annoing event happened to a few files before.
What should I do to open it properly?
Thank you
Drag and drop the file on StuffIt Expander. If you don't have StuffIt Expander, it's available from http://www.allume.com
To change all files like that, do a "Get Info" on the file in the Finder, change the preferred application to StuffIt Expander, then click "Change All..."