INT 2F - PCED/ASSOC - ASSOCIATION TEST                                          
	AX = 48C5h
	BL = 02h
	DS:SI -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. filename
Return: AX = status
	    0000h if filename is unknown
	    0001h if there is an association defined for the file
	BX destroyed
Program: ASSOC is a resident utility included as part of the PCED package which
	  associates files with executable programs based on their extensions
Note:	chains if BL > 02h on entry
SeeAlso: AX=48C0h,AX=48C5h/BL=00h,AX=48C5h/BL=01h