Used to have a problem with my LiteOn in WinOnCD 5.03, so made a regfix myself.
However I now have WinOnCD 6 PE, so have exported the GRI string (Driver library) and also have saved the GRI_MMC.DLL.
Tried them both on my old WinOnCD 5.03 and LiteOn was seen perfectly after. It has info on all the latest drives, including LiteOn LTR-48246S.
If anyone wants the 2 files, leave an email addy.