Module

NWN2 Modules
Modules in Neverwinter Nights and Neverwinter Nights 2 are self-contained game files that hold all of the gameplay information for a particular adventure. For example, the Prelude chapter to NWN's official campaign was created with a file called "Prelude.nwm". This file could be opened in the Toolset and edited and saved as a new module file to be played later.

Module files come in two versions: .mod and .nwm

.mod files are usually community made modules that can be freely edited, played and distributed on community sites like NWVault.

.nwm files are module files created by Bioware or a developer officially contracted to create an official module file. These files are usually write-protected and can be edited by the community, although it is generally suggested that you edit a backup copy instead of the original.