You should download wallet which can open your backup, try to remember what kind of wallet you used previously since usually you can't open the file in different wallet application.
Hi! Thanks, I have been able to figure out Dogecoin. But I can't restore Terracoin. Precisely, I can't find where to download the wallet. When searching for "terracoin wallet mac" in Google, the top link I get is to Electrum Bitcoin Wallet for some reason, and the next two results seem related to terracoin, but they lead to dead pages. Does anyone know anything about that?