Found my old litecoin wallet, or maybe the key, I can't tell. Trying to recover

When I use command line to try and import it tells me invalid private key encoding (code -5) so I assume it’s the wallet itself and now the key?

How do I import this into litecoin core and recover my walllet properly?

Cheers for any help.

Please post in the forum under the technical support category. I think many will be willing to help.