pfx file encryption algorithm

This seems like it should easily documented but I am unable to find.

My c# code does this to create a pfx file.

X509Certificate2 cert = store.Certificates.Find(X509FindType.FindByThumbprint, thumbPrint, false);                     File.WriteAllBytes("certFile.pfx", **cert.Export(X509ContentType.Pfx, password)**); 

The class X509Certificate2 is from System.Security.Cryptography.X509Certificates which appears to be a built-in .NET library.

I would like to know what encryption algorithm is being used to protect the pfx file. I want to confirm whether it is AES256 or not, but I can’t seem to find this information anywhere.

I tried running this OpenSSL command on my "certFile.pfx" file. I had trouble with password so I used "no password" command line. Does this mean that the pfx file is encrypted using TripleDES?!

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