Yes, I tried several times on Wikipedia. No effect. Because I saved POW wallet's wallet.dat only a few years ago. Now restore wallet.dat to POW and you can open it. However, the input "listunspent" does not return any address. I think it's because my POW isn't synchronized. Failed to restore wallet.dat to POS wallet. POS won't open. Now is really confused. I have millions of Nobel files backed up. But I may lose them forever.