To convert a Microsoft Authenticode cert from .spc format to a .p12 format requires first that the cert be exported to pfx then converted to PKCS12 (.p12). the tools required to do this are the pvkimprt too, a browser like Netscape (I used version v8.1) or other mozilla browser like Firefox, and Internet Explorer. I used Netscape instead of Firefox because Netscape is a much more mature browser with less bugs than Firefox.

After installing the import tool, start the import by running the command at a command prompt:

pvkimprt mycert.sps mykey.pvk

This will start a wizard that imports the certificate into Internet Explorer. When asked, add the importing cert into the personal cert category. Once complete, use Internet Explorer to export the cert in pfx. Go to tools > Internet options > content > certificates. This will start the export wizard. Answer yes to export private key and select the file format which in the case will be PKCS#12(.PFX). Enter a password and folder location to place the exported file.

Next start the Netscape browser and go to tools > options > advanced > manage certificates. Located the pfx file that was just created from Internet explorer. Enter the password again. Netscape gives you the option to change the password for the certificate at this time too. Once complete, you'll see your cert stored in Netscape's list of certificates. Select the one you would like to export as a .p12 file and choose backup (there is no export button). The idea here is that you will be making a file backup of the cert into a file, the file will be in .p12 format. Follow the prompts for file locations and password and you will have a .p12 formatted file after starting with a .spc cert.

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