True, and AFAIK OpenVPN (and the included 'Easy-RSA' certificate creation scripts) makes use of OpenSSL.
Although Abylon reader
has the ability to create its own certificates, I have never used it for that purpose. The reader helps you find out the where/which/when about the certificates in your system more quickly and clearly than the certificate MMC console from Windows.
Plus the reader comes with extra tools for the perfect price, free.