How to use a 2016 version Monero wallet .keys file

full image - Repost: How to use a 2016 version Monero wallet .keys file (from Reddit.com, How to use a 2016 version Monero wallet .keys file)

I have a small amount of XMR there. I almost forgot it.Today, I downloaded the newest Monero software yet it says "incorrect password" for the .keys backup.I am pretty sure the .keys backup was good and enough. And I am pretty sure the password was not "incorrect".I googled and I believe this is due to incompatibility between the new software and the old wallet.So, how can I use a 2016 version Monero wallet .keys file? (It's 631 bytes)

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