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This site uses Akismet to reduce spam. Learn how your comment data is processed. You can use the OpenSSL Command line tool. The following commands should do the trick. openssl pkcs12 -in unecdown-5l5.ga -out unecdown-5l5.ga -clcerts openssl pkcs12 -in unecdown-5l5.ga -out unecdown-5l5.ga . Is there an inbuilt C# mechanism to convert PEM files to PPK files? (you may guess that Amazon EC2 gives me a PEM file, and I need to use the PPK format for SSH connectivity). In summary, there are four different ways to present certificates and their components: PEM - Governed by RFCs, its used preferentially by open-source software.