INT 21 - Banyan VINES 2.1+ - SET EXTENDED FILE ATTRIBUTES                       
	AX = 4311h
	CH = new attributes (see #01422)
	DS: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
Return: CF clear if successful
	CF set on error
	    AX = error code (01h,02h,03h,05h) (see #01680 at AH=59h/BX=0000h)
Note:	the filename may be a directory but must be on a VINES file service
SeeAlso: AX=4301h,AX=4305h,AX=4310h,INT 2F/AX=110Eh

Bitfields for VINES extended file attributes:
Bit(s)	Description	(Table 01422)
 7	unused
 6	shareable
 5	execute-only
 4-0	unused