Transferring Golem (GNT) from JAXX Wallet

I had some Golem in a Jaxx wallet on my old PC which I no longer have access to. Before losing access I did back up my private key (or at least, I think/hope I did).

My Golem is still in GNT form and I never migrated it to GLM. I have what I believe is the private key but I can't figure out what to do with it. I tried putting it into MyEtherWallet but it says its not a real key? Not sure if this is because it's still in GNT form and not the new GLM form. Any help would be appreciated. It's not worth much (<$50) but if you can help out I'd gladly tip!

The file I exported starts with "address,privatekey," followed by a 108 character alpha-numeric string. Oddly enough, 2 of those characters are commas?? 1 randomly within the string, and the 2nd at the very end. There are 64 characters after the comma (not including the comma at the very end) and 42 before the comma.

I no longer have access to Jaxx wallet so this private key is all that I have left