Privat Game [Engine import]

[VcsShiva]

I'm really interested in launching my own little Flo. I tryed to mod the .nif files but dont know how to repak them into .pak :/ So i requested the use of the gamebryo engine, which is the engine Florensia is working with. My idea was to simply import the game data from the Florensia data files into the engine. (since i dont know if its possible to import in UDK / UE4 ??) The problem is the engine only wants to work/start with a game solution data (.gsl). Anyone can tell me how to get the game back into the engine it's produced with? If this isnt possible.. Is there any way to reimport some of the data? Because i know, for example skyrim is using .nif files too...
Link to picture:

[raulnns]

Do you can use to repack

[tankerloft]