Prerequisites

• Microsoft's tool to import PVK files (For Windows 2000/XP Only!)
• Your code signing certificate from Sectigo (as PVK and SPC files).

Install pvkimport you downloaded from Microsoft.

• Note: Remember the paths to where you installed it (c:\\codesign\\)
• Copy your certificate/key (mycert.spc & mykey.pvk) files to the directory where you installed 'pvkimport'
• Open a command-prompt and change to the folder where you installed 'pvkimport'. (c:\\codesign\\)
• Combine your SPC and PVK certificate/key files that you received from Sectigo into a PFX file using 'pvkimport':

• This will start a wizard. Choose options:
• Yes, Export the Private Key (check)
• Include all Certificates in Path if possible (check)
• Enable strong protection (uncheck)
• Delete the private key if export is successful (uncheck)
• Enter a password
• Choose a location (c:\\codesign\\mycert.pfx)
• Finish.

You can check the private key has been imported successfully by using MMC.

• Open MMC
• Select add/remove snap in and select certificates. (Computer Account, Local Computer)
• Opening your code signing certificate should show code signing usage and that you have the private key.