Today i downloaded a wallet backup from a website, the extension to it was ".json". There was no program in my computer that could open this file.
I think if i used a desktop wallet, i could load it or import or something like that from what i read.
Does it have the backup phrases inside it like i got when i first started trezor ? Or does it have private key which if i load in block chain then loads my receiving address? What exactly is in it and is it mandatory for me to use a desktop wallet to load and look into it ?
Is it Bitcoin wallet?
There is another way much easier. Go back to that website and use your json file, then get the private key from it. Get the private key and download a wallet, example: Electrum. Final, import your private key to Electrum. It's easy to use