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Microsoft software imports client certificates from .p12 (also known as .pfx) files. If you received .crt and .key files instead of a .p12 file, you must convert them to .p12 format. You can do this with the free program OpenSSL.exe from the OpenSSL Project.
Example
You receive the files fred.crt and fred.key. To convert them to a single fred.p12 file, use the following command:
openssl pkcs12 -inkey fred.key -in fred.crt -export -out fred.p12
This command prompts for the password to the fred.key file before it writes the fred.p12 file.