Changing .crt file into the .cer format
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Double-click on the yourwebsite.crt file to open it into the certificate display.
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In a new window go to Details and click button Copy to File.
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Click Next.
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In the Certificate Export Wizard select option Base-64 encoded X.509 (.CER) and click Next.
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Click Browse (to locate a destination) and type in the filename yourwebsite.
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Click Next and Finish.
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You now have the file yourwebsite.cer