Convert PEM to PFX
Install the latest Open SSL.
Copy the PEM file to the OpenSSL binary folder, such as C:\Program Files\OpenSSL-Win64\bin
- Open an administrative command prompt to that folder
.\openssl pkcs12 -export -out result.pfx -inkey mypemfile.pem -in mypemfile.pem
You will be prompted for a PFX password as part of the process.