You need to associate the *.rpl extension with Toribash.
Open a folder (My documents for example), go to "Tools", Files Options (The last button), then look for the *.rpl extension and associate it with Toribash. Should work.
Yea, ive tried associating the replays with both tb.exe and toribash.exe , neither worked. This was like a month ago aswell. But at least i can watch replays, so im not complaining too much.
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