I recently came across my old laptop and while I was checking for any important files to keep before discarding it I realized that there was still a 2013 version of Litecoin QT on it which holds several LTC. I then remembered that that during late 2013 and early 2014 I mined some LTC on my laptop as well as my PC - nothing serious, just for fun.. Not much came of it, but I created several private keys, which I found in a word file (talking about being security conscious...) All of them are alphanumeric, 54 characters in length and start with the letter T. I believe they are not encrypted - the wallet on my laptop also isn't. If I create a new private key from the old Litecoin QT on my laptop (which doesn't sync anymore)I get the same format: 54 alphanumeric characters starting with a the letter T followed by a number.
I just downloaded the latest version of Litecoin Core on my new PC and after it synced I tried to import several of the old private keys - and got an error message.
The message that I got was Invalid private key encoding (code -5)
I searched the net to find answers on how to import these old private keys, but came up empty. Any help would be appreciated.