INT 21,5B - Create File (DOS 3.0+)

	AH = 5B
	CX = attribute
	DS:DX = pointer to ASCIIZ path/filename

	on return:
	AX = handle if CF not set
	   = error code if CF set  (see DOS ERROR CODES)

	- standard method of opening files
	- returns a file handle of a file opened with specified
	  attributes (combinations of normal, system and hidden)