OK, did more reading, although I don't have a complete grasp of this.  I ran
C:\btcrecover-master\extract-scripts>extract-bitcoincore-mkey.py c:\btcrecover-m
aster\wallet.dat
Partial Bitcoin Core encrypted master key, salt, iter_count, and crc in base64:
YmxxxxxxqaVIxxxxxxxx6PjjUxxxxxxh/Jaxxxxxx8x/GCitxxxxxxxxDxxxxxxx21

and got above long string
then ran:
C:\btcrecover-master>btcrecover.py --data-extract --passwordlist
Starting btcrecover 0.17.9 on Python 2.7.13 32-bit, 16-bit unicodes, 32-bit ints

Please enter the data from the extract script
> YmxxxxxxqaVIxxxxxxxx6PjjUxxxxxxh/Jaxxxxxx8x/GCitxxxxxxxxDxxxxxxx21
Please enter your password guesses, one per line (with no extra spaces)
Use exit() or Ctrl-Z plus Return to exit
password1
password2
password3

exit
Wallet difficulty: 61,696 SHA-512 iterations
Using 1 worker thread
5 of 7 [#################################--------------] 0:00:09, ETA:  0:00:03
Password found: 'xxxxxxxxxxxxxxxxxxxxxx'

How do I get the private key out of the script?  More reading ? Thanks for all your help.
Tried pywallet --dumpwallet on it again but was no help.
I think I have the answer bitcoin-tool ... but having trouble compiling it.

Thanks for replies. Have just now installed btcrecover and will run it, but wanted to know what will convert the encrypted password to WIF format.
as in the original example in this thread.
 "addr": "12KGAcU47BhCSQJCN9r2dHAvhDALMVsJkk",
            "balance": "15508294",
            "compressed": true,
            "encrypted_privkey": "f912462631805fb602ad6ce5763d6394f25d6374e71a55be1dfe3948bc1f483a256685238ce6459 7ff0afe69b03a8183",
            "label": "Slush",
            "pubkey": "037023ec20116784122552ca485e7459a63228cb067e96c556e30a3b1f8c316a45",
            "reserve": 0
How does one convert this "encrypted_privkey" to wallet import format? If one had the key how to deal with the encrypted key? Thanks.

I have 5.54 bitcoin in one 33 character address from 2010, the wallet.dat file had been created with bitcoin-0.3.14-win32-setup.exe. I have a similar problem trying to find my private key from the "encrypted key", the wallet.dat file was overwritten, so I scanned drive with pywallet and it gives me the "encrypted key" string. How does one convert the encrypted key to the bitcoin format? Thanks for any help.