Just copy both the BSA, TXT and ESM to \fallout3\data\ folder.
See post #8 above.
\fallout3\data\BrokenSteel - Main.bsa
It could be a totally different issue too. I only had that problem with a custom texture that was not created correctly. It worked in game but not in the GECK.
You could provide a screenshot so we know what you are talking about.