I'm horrible at batch files, and was tired of manually doing everything for converting the XSI files over to MESH, so I wrote a GUI to do it for me and decided to release it under GPL 2.0 for everyone to use (or improve).
Design your own custom maps & modifications for Sins of a Solar Empire with the the Forge Tools. This package contains tools used by the development team to create maps & other content included with the game. It includes the Galaxy and Particle Forge