2. Open your wallet.dat with any text editor and look for text/string which represent a cryptocurrency (on Bitcoin Core, usually list of the address are on bottom of file/line). It's painfully slow method and i don't recommend this method.
Actually just search for "name" and the address will be right next to it.
You're right, i didn't know about it. But is it same for older version of wallet (which forked from Bitcoin-qt or Bitcoin Core) ?
Same for ALL wallet.dat format files.