:: you will find pvk2pfx.exe in the WDK
:: https://docs.microsoft.com/en-us/windows-hardware/drivers/download-the-wdk
:: correct the C:\ path below if needed

:: use -po <newpassword> to set a different password
pvk2pfx.exe ^
  -pvk Hobot-XJ3-CA.pvk -spc Hobot-XJ3-CA.cer ^
  -f -pfx Hobot-XJ3-CA.pfx
