Can’t generate larger key than 1024, keys cannot be exported

Hello, 

I am trying to generate a larger RSA key than 1024, but it appears this doesn’t not allow that. Is it possible with LockBox?

Also, I have generated a key pair but the private key cannot be used outside of Delphi. I have attempted to use it in a C# Visual Studio program and I cannot get the key to work no matter how it’s formatted.  Any ideas? 