if want to try yourself
use python 2.7 from Miniconda2

https://docs.conda.io/en/latest/miniconda.html
Python 2.7   Miniconda2 Windows 64-bit

install Miniconda2  done you got python 2.7 for run pywallet

and pywallet from github
https://github.com/jackjack-jj/pywallet
https://github.com/joric/pywallet

create folder name
C:\pywallet

command pywallet
python pywallet.py --dumpwallet  --datadir=C:\pywallet --passphrase=PASSWORD > dump.txt
or
python pywallet.py --dumpwallet  --datadir=DATADIR --wallet=WALLETFILE --passphrase=PASSPHRASE

try you password unlimited wallet.dat now lock file

ask command line from thread
https://bitcointalk.org/index.php?topic=34028.0