I was able to use doubleshadow's galaxy editor to open 04 security cat, open maps, select X3 universe pck, then opened it and saved it as XML into deepsilver/X3 reunion/maps folder, not inside that cat04 file.
you can get doubleshadow galaxy editor here
http://www.doubleshadow.wz.cz/x2e/index.php?p=download
I hope doubleshadow is currently working on making new updates for this editor since we see new sectors are not in names but in numbers, new stations, ships, wares, etc which this editor does not recognized. Only thing we can make changes for now is by adding or removing, moving asteroids or change their yields, and add gates, maybe create new sectors too. I tested it by adding a 40 yield silcion and ore roids in argon prime, then they do appear in X3 game, so it does works. But I wouldnt touch new ships and stations even the wares inside stations until doubleshadow get new editor or updates for it.