Problem with importing .pri key file into WinSCP

I am trying to import a .pri key using Puttygen, but when I do, it says that it is not in a format that is recognized. The key is in SHA-2 format. If I try to import the key into WinSCP, it tells me that the key is SHA-2 and that I need to convert it. I need to use they key with WinSCP, but I am not sure how to convert it.

Any help is appreciated.

Use PuTTYgen application:
https://winscp.net/eng/docs/public_key#private
https://winscp.net/eng/docs/ui_puttygen