Right Clicker replied to Is there a way to transfer worlds to another player? February 11, 2022 @ 8:26:04 pm PST
There is a worldname.fwl and worldname.db file located here:
C:\Users\%username%\AppData\LocalLow\IronGate\Valheim\worlds
Transfer those files to your friend and that's it.
Thank you!
6:13 am, February 12, 2022