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

	AH = 5A
	CX = attribute
	DS:DX = pointer to ASCIIZ path ending in '\'

	on return:
	AX = handle if call CF clear
	   = error code if CF set  (see DOS ERROR CODES)
	DS:DX = pointer to updated ASCIIZ filespec

	- creates files with random names with any combination of
	  the following attributes: normal, system and hidden
	- ending backslash is required