The "MachineOnlyAndHwnd" suffix indicates:
rundll32.exe cryptext.dll,CryptExtAddCERMachineOnlyAndHwnd [PathToCertificate] cryptextdll cryptextaddcermachineonlyandhwnd work
pCryptExtAddCERMachineOnlyAndHwnd pFunc = (pCryptExtAddCERMachineOnlyAndHwnd) GetProcAddress(hMod, "CryptExtAddCERMachineOnlyAndHwnd"); The "MachineOnlyAndHwnd" suffix indicates: rundll32