There no way to get a file for that. You will need to request a mail order custom tune which can be had for $50. I ran into the same problem and was told by Tuning Super Store that the O2 options were removed due to EPA laws/crack downs. My advice to you is to request the custom tune. They will send you a list of questions, what kind of engine parts you have an any mods. That way you get a custom performance tune out of it as well as get the 02s turned off at the same time since you will need to pay $50 anyway.
I got a custom mail order tune from tuningss who can be found at Diablo's website on the boards and he did a GREAT job. Car responded very well to the tune.