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Just change the file extension from . crt to . pem in the Windows File Explorer. In order to convert SSL certificate files, you need to use third-party tools.
pem adds a file with chained intermediate and root certificates (such as a . ca-bundle file downloaded from SSL.com), and -inkey PRIVATEKEY. key adds the private key for CERTIFICATE. crt (the end-entity certificate).
You can do this conversion with the OpenSSL library. Windows binaries can be found here.
Once you have the library installed, the command you need to issue is:
openssl x509 -in mycert.crt -out mycert.pem -outform PEM
I found the OpenSSL answer given above didn't work for me, but the following did, working with a CRT file sourced from windows.
openssl x509 -inform DER -in yourdownloaded.crt -out outcert.pem -text
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