- It works but, with Restore, you don't have to place it inside your bitcoin data directory because...

- Because with "Restore", Bitcoin Core will create its own wallet path inside wallets folder, the folder will be named as the wallet name that you've set.
  Then it will make a copy of the wallet file that you've selected, and load it.

  With "Open", it skips all the above and proceeds to load the wallet file, but the option can only see wallets in the data directory or wallets folder.
  In this case, pasting the "wallet_fake_008.dat" in the datadir/walletsdir is necessary.

  Since you've used the former, you can now remove wallet_fake_008.dat from your datadir if you didn't opened it since it already has a restored copy inside "fake" folder.
  But there's no harm on keeping it aside from it will show in your "Open Wallet" menu.
 
- Differs per wallet and machine specs.