I find an old unencrypted (the wife's laptop) backup wallet 2011-2012 from the wife's laptop.
I install Core v0.15.0.1 and open it as normal. (The chain hasn't finished downloading yet)
I try to dump the wallet and keys from the console and get the following errors:
dumpwallet with the appropriate string etc:
Cannot open wallet dump file (code -8)
Exporting individual private keys produces:
Private key for address XYZ is not known (code -4)
Is this some kind of comparability issue where I need to use an older version of core/qt or?