Just checked and it is indeed binary. Not sure if it supports adding extra fields (like Android sensors). I might have to talk to Mark about that one (although he doesn't seems to be replying to me email lately, or just being busy maybe ?)

So the TunerPro log viewer is just playback ? I'm wondering how that can be useful ? I like to see curves of the data and stuff... What an XDL file has over a CSV format that you would open with MegaLogViewer for example ? Just curious :)