INT 2F,2 - Multiplex Interrupt - Cancel file

	AL = 02
	AH = 01  resident portion of PRINT
	     02  resident portion of ASSIGN
	     10  resident portion of SHARE
	     B7  resident portion of APPEND
	     C0-FF reserved for user applications
	DS:DX = pointer to ASCIIZ filename to cancel


	returns nothing


	- accepts wildcards