INT 17 U - Emulaser ELTSR - OPEN CAPTURE FILE                                   
	AH = 07h
	ES:DX -> 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 to be opened
Return: ???
Note:	new output will be appended to the specified file
SeeAlso: AH=08h,INT 1A/AH=E5h