I looked at the driver on NI's web site and it does return a t0 and dt that is displayed on the graph. I'm looking a LCDSO Base Read 1 (single) and that returns a cluster with the timing information as well as the waveform array. The top level Application Example should display properly. Which VI are you running that you don't see this? Can you post a VI with data from the scope or an image of the front panel.
As far as saving to file, how did you wire the cluster from the acquisition function to the Write to Measurement File. If you just unbundled the amplitude array, then of course there's no timing information. You should unbundle and wire the values to the Build Waveform function. Then you can wire the output of the build waveform to the Write to Measurement File.
