Only a handful of ISO 639-3 languages are supported by Qt. Standard Malay is not one of them. Using the macrolanguage code seems fine. Not too sure what the numerusform is for a macrolanguage, but appears that wikipedia equates MS w/ "bahasa" too

[patterns]
**.h = native
**.c = native
**.cpp = native
**.lua = native
**.txt = native
**.pas = native
**.inc = native
**.hs = native