VJOYD_OpenConfigKey_Service
The VJOYD_OpenConfigKey_Service macro is used by joystick drivers to open a configuration key. This should mirror the IDirectInputJoyConfig8::OpenConfigKey method.
VJOYD_OpenConfigKey_Service, SERVICE
ENTRY:
eax = ID of key to openecx = address of a DWORD in which to store the key
EXIT:
eax = same as _RegOpenKey except that ERROR_CANTOPEN is returned if VJoyD has not yet established the current configuration key.