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SSH and PuTTY keys are of different formats and will have to be converted to each other's format if you want to use the same key between the 2 programs. Follow these steps to convert SSH's key to PuTTY's.

  1. Download PuTTY Key Generator (puttygen.exe) from the following URL.
    https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
  2. Launch the program and click on the Load button.
  3. Set the Files of type to All Files (*.*) and select your SSH's key file.
  4. Enter your key's passphrase if prompted.
  5. A prompt will pop up once conversion is successful. Click on Save private key.
  6. Choose the filename and folder to save the file to.