DLC Merger
DLC Merger is a mod that allows you to merge DLC archives, such as the Siege of Dragonspear expansion, with the main game. This step is required if the game expansion is distributed as a separate DLC before the game can be properly modded.
Version 1.7 improves error handling if the DLC file could not be renamed after a successful merge operation.
Download: GitHub
Discussion: Beamdog
Read the original article at The Gibberlings Three