INT 2F - ZyXEL ZFAX v3+ - CONVERT FAX                                           
	AX = DB13h
	DS:SI -> source filename, including path (max 128 characters)
	DS:BX -> destination filename, including path (max 80 characters)
	CX = destination file format
	    00h FAX, 01h PCX, 02h TIFF, 03h PRN
Return: AX = status (see #03096)
SeeAlso: AX=DB11h,AX=DB12h,AX=DB14h,AX=DB22h