Hi I have came across a few old wallet.dat files on my PC.

After letting Bitcoin Core sync for 24 hours, the program is now ready.

I have a few questions.

I have pasted the file inside of this directory
C:\Users\Admin\AppData\Roaming\Bitcoin

I then opened BTC core and did the following:
File > Restore Wallet > C:\Users\Admin\AppData\Roaming\Bitcoin\wallet.dat

It the asked for "Wallet Name" I just entered anything.

After this I had the error:
Wallet loading failed. Wallet files should not be reused across chains. Restart bitcoind with -walletcrosschain to override.

I'm wondering do I simply just add the this (-walletcrosschain) or am I importing the wallet incorrectly?

Any help is appreciated!