To open Rpd ,follow the below steps .
Steps :
From the above screen select “select the program from list” radio button and click Ok.
You will see the below screen
Click on browse and navigate to the below path .
<MiddlewareHome>\Oracle_BI1\bifoundation\server\bin
Select the Admintool.exe and click on Open.
Check “Always use the selected program to open this kind of file” and click OK.
Now double click on rpd and you should be able to open the rpd by just double clicking .