If a user loses access to their Bitcoin Core client or their computer crashes, they must locate their local wallet.dat file to restore their funds. By default, this file is hidden in your operating system's hidden data folders. For example, on a standard Windows installation, the file resides in the %APPDATA%\Bitcoin directory. 2. Legacy Address Sweeping
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The following breakdown explains the security implications and the nature of these files: Exposed Wallet Files ( wallet.dat indexofwalletdat free