Combine PVK + SPC to PFX
Prerequisites (Must haves)

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

  1. Install pvkimport you downloaded from Microsoft.
    Note: Remember the paths to where you installed it (c:\codesign\)

  2. Copy your certificate/key (mycert.spc & mykey.pvk) files to the directory where you installed 'pvkimport'

  3. Open a command-prompt and change to the folder where you installed 'pvkimport'. (c:\codesign\)

  4. Combine your SPC and PVK certificate/key files that you received from Comodo into a
    PFX file using 'pvkimport':
    c:\codesign> pvkimprt -import –pfx c:\codesign\mycert.spc c:\codesign\mycert.pvk
    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)

  5. 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.

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