INT 60 - HP 95LX System Manager - OPEN FILE

	DI = 0500h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
		DWORD	pointer to file state record (see #03287)
		DWORD	pointer to filename
		WORD	length of filename
		WORD	???
		WORD	suppress buffering if nonzero
Return: AX = status
	STACK unchanged
SeeAlso: INT 60/DI=0501h,INT 60/DI=0502h,INT 60/DI=0508h