Hello,
shlobj.pp defines SHOpenPropSheetA but, that function no longer exists in Win 7 through Win 11.
In does exist in Win XP. I do not know if it exists in Vista.
Anyway, it might be worth adding a comment to SHOpenPropSheetA in shlobj.pp noting that the function is only guaranteed to be available in Win XP (it might be available in the Win9x series but, I have not checked, therefore I don't know.)
HTH.