Can´t open sample termbase : ".sdltb" file

I have recently updated SDL Trados Studion aswell as Multiterm. Now i can´t access multiterm to manage my terms. My PC can´t find a program to open a ".sdltb" file. When i doubleclick the Multiterm application nothing happens. When i doubleclick a termbase it asks me how i want to open the file.

Thank You in advance!