AWS PEM to PPK but missing SSH-2 RSA

You may be wondering, in AWS documentation, the PuTTY Key Generator show SSH-2 RSA and it is missing in the newer versions.

Just select "RSA" because it is for SSH2 and the rest of the options except for one which explicitly says "SSH-1 (RSA)".

https://the.earth.li/~sgtatham/putty/0.68/htmldoc/Chapter8.html#puttygen-keytype
8.2.2 Selecting the type of key
Before generating a key pair using PuTTYgen, you need to select which type of key you need. PuTTYgen currently supports these types of key:

• An RSA key for use with the SSH-1 protocol.
• An RSA key for use with the SSH-2 protocol.
• A DSA key for use with the SSH-2 protocol.
• An ECDSA (elliptic curve DSA) key for use with the SSH-2 protocol.
• An Ed25519 key (another elliptic curve algorithm) for use with the SSH-2 protocol. 

Hope this helps. :)