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When you create a key pair for an EC2 instance you can choose RSA or ED25519 as the key pair type and ".pem" or ".ppk" as the file format. You only get one chance to save the file as PEM or PPK, but can convert between both formats by using a tool like PuTTY Gen. Please see the AWS documentation for more info on the creation process: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/create-key-pairs.html#having-ec2-create-your-key-pair
answered 5 months ago
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Please can you explain more details how you got the key and where are you trying to use it?