Right Click >> Open With >> Choose Default Program >> Open Using already installed software
Make Sure you have "Always use the selected program to open this kind of file" checked.
If toribash isn't already in the recommended programs, click browse.
Go to wherever toribash is located for you, for me it would be desktop, make sure it is toribash and not a replay. Double click toribash, or click once and hit open.
Click ok.
Once you do all of this you should be able to open replays with toribash instead of wordpad or notepad.