I'm running out of ideas and I'm hoping to get some help. My computer crashed but I have the wallet.dat file on a thumb drive. I've downloaded and synced v0.18.1 on a new computer but don't see any way to add the .dat file using the GUI. Do I have to use the command line prompts? If so, the proper procedure would be very helpful. I did see a similar situation on this forum but the advice given was over my head. Thanks to anyone who can help.