Converting a PuTTY Private Key (.ppk) to OpenSSH (.pem)

ASP: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
SQL Server: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
C#: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
C++: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
MFC: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
C: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
Delphi: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
Visual FoxPro: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
Java: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
Perl: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
PHP: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
Python: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
Ruby: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
VB.NET: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
Visual Basic: Convert PuTTY Private Key (ppk) to OpenSSH (pem)
VBScript: Convert PuTTY Private Key (ppk) to OpenSSH (pem)