Quoting GoaFan77, reply 3
I think Larani meant the GalaxyScenarioDef file, not the entity.manifest (another very commonly changed file).
That said, while that advice works for mods, I fear it won't work with the forbidden worlds DLC. The GalaxyScenarioDef file even in Rebellion's GameInfo folder is missing the data for the DLC planet bonuses, which means they will be impossible to spawn in. Only a update where the devs add that missing info in or a mod will be able to allow you to spawn them.
Actually I meant the entity.manifest file since that is were the planet bonus would be listed now if they wanted planets from the DLC then that might be a problem if they didn't include that info in Rebellions GalaxyScenarioDef file. Stange I would think the DLC would have new copies of both those files
The entity.manifest tells the game what files to load. They will be listed in the manifest but that does not help them get it into a map. The GalaxyForge uses the GalaxyScenarioDef file to populate the items you can place, you'll notice the galaxy forge app itself has no entity.manifest file. And yes, if the game had a bad entity.manifest file, those bonuses would not even be loaded at all.
The GalaxyScenarioDef file essentially acts as a bridge between entity and map files, so that it knows what entity file to use when a map calls for a specific object. The problem is it is not necessary to update this file for things like planet bonuses and artifacts, since those usually are placed around the map randomly and the random placement is controlled in the planet entity files. That's why until the 1.1 patch in Rebellion, the only planet bonuses placeable in galaxy forge without a mod was Crystal Miners. 
They functioned perfectly well in random maps but without a reference in the GalaxyScenarioDef file map makers could not force spawn them.
