The Bitcoin Core software (v. 28.1.0) took 9+ hours to complete the 'Restore' procedure.
That means it was rescanning the wallet.
1) could 'w1' name be a problem? Is it possible old wallet.dat needs an 'old school' name to be recognized by the current bitcoin core software?
No, the name doesn't matter.
2) I never saved the full FOLDER when the old computer was still operational - only the wallet.dat. And I read on the forums here the wallet.dat file could be corrupted, and I SHOULD HAVE saved the full folder containing wallet.dat
That is possible, and any data that was not compacted into the wallet.dat at the time that you made the backup would be lost.
What is my next step to see if I can even 'revive' this wallet - in the new software - so I can try to remember my password?
It is restored so you can try to guess your password. That is independent of whether any transactions are found. You can try to rescan it again with the
rescanblockchain RPC to see if it finds your transactions.