INT 16 U - PCIBM PC Tools v6.0-8.0 DESKTOP - GET ??? PATH
	AX = FFA7h
Return: 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. path (directory from which PCTools was run???)