Is there any way i can get replays to open with 3.71 instead? Also, the replays i open are glitchy and twitchy, and the game rules/mods set to default. Even if the replay is longer than 500 frames, the players keep moving, after the game ends.

That happens to all replays?

Generally it should happen if you save a replay before it loops or something.

To get them to open in .71, go to any folder, tools - folder options - file types. Find RPL, press change and select the tb.exe from your .71 folder. Should work.