Can you try to import the dump file directly into bitcoin core folder?
You can find the Bitcoin core folder on this path %APPDATA%\Bitcoin or this one below

Under that folder, if you see a wallet.dat file just rename it with different name like wallet.dat.bckup(or if currently no balance you can just delete it) then put the file dump which is this "UsersAdministratorDesktopWalletsDesktopDBitcoinBUwallet.dat" rename it to wallet.dat

Now you can open the bitcoin core wallet.


Be careful about posting this "extended private masterkey" you must be deleted it if this is your wallet with a bitcoin balance. Remove this as soon as possible because if someone finds this they can use it and import it to their wallet to get your bitcoins from this wallet.

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It seems you already have a thread the same as this question before. Check your old thread from here https://bitcointalk.org/index.php?topic=5222213.0
You can find many answers from your thread related to this.