INT 21 - DOS 4.x only - SET EXTENDED ATTRIBUTES
        AX = 5704h
        BX = file handle
        ES:DI -> EAV list (see AX=5702h)
Return: CF clear if successful
        CF set on error
            AX = error code (see AH=59h)
Note:   the default DOS 4 behavior is to do nothing and return successfully
SeeAlso: AX=5702h,AX=5703h,INT 2F/AX=112Dh

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