This works even while the wallet is loaded.
: Press Win + R , type %APPDATA%\Bitcoin\ , and hit Enter. Vista / 7 : C:\Users\YourUsername\AppData\Roaming\Bitcoin wallet dat
Mira wasn’t a coder. She was a history teacher. But grief made her curious. She downloaded a Bitcoin core client, synced the blockchain (which took three days and a stern email from her ISP), and replaced the default wallet file with Leo’s. This works even while the wallet is loaded
bitcoin-qt -wallet=mybackup.dat
Never upload your wallet.dat file to an online recovery service or file scanner. If a service asks for your wallet file to "check" it, they can potentially steal the keys inside. wallet dat