Using a .ppk key with `ssh`
Use PuTTYgen to convert it to the apropriate format.
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If you need the private key, use PuTTYgen's Conversions → Export OpenSSH key menu item on Windows, or run the following command on Linux:
puttygen MyKey.ppk -O private-openssh -o MyKey.key
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If you only need the public half, copy&paste it from PuTTYgen's "Public key for pasting" box. On Linux, use a similar command as above, only replacing
private-opensshwithpublic-openssh.
(On Linux, PuTTYgen is usually available in the package putty or putty-tools.)