[racket] Dowloading Files with the .rkt Extensions

Hello Racket Users;
 
I am learning to programme online using Racket but I a having problems opening / downloading the problems on my blackboard. 
 
I then uninstall Rackett and right click to open in a new window. This it does. 
 
Could you advice me what I did wrong and how to resolve this?
 
A classmate suggested this might have to do with my operating system - Vista. 
 
Your answer is greatly appreciated.
Vashtie  
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