In order to import a certificate into Windows certificate store, you need to access it from the Microsoft Management Console (MMC).

First, you need to add the Certificates Snap-In into the MMC


Then, you can import the CA certificate into the Root Certificate Stores.



There are two Root Certificate Stores in Windows systems, Trusted Root Certification Authorities and Third Party Root Certificate Authorities. Usually, you would import a CA certificate into the Trusted Root Certification Authorities.





Expand Trust Root Certification Authorities

Right Click Certificates.

Select All Tasks > Import





In the Certificate Import Wizard click Next





Click Browse





Select the CA certificate file to be imported

Click Open





Click Next





Click Next





Click Finish