We are just putting together the 0.7.4 patch for XTM and have come across a problem. In X3 2.5 you have the new 'Upload data' icon, unfortunately in XTM 0.7.3 it is missing.
I had assumed there had been an engine upgrade to enable the icon, and then a new line in icondata.txt to point to it. How wrong I was.

Having looked in the 2.5 cat/dat set there isn't a new icondata.txt, so I need to know what needs adding/changing to get this to work so that 0.7.4 is fully compatible with 2.5.