2da files are the data files that are used by the game for all kinds of purposes. Some contain class level-up feat lists, some contain item magic property lists, some contain experience point tables, and so on. Practically every aspect of the game uses a 2DA file.
In NWN2, the 2DA files are located in the installation direcotry under the "\Data" sub-folder. All 2DA files are compressed into a single .ZIP file within that folder. Patches and updates provided by Obsidian modify these files directly. However, the 2DA files may be individually extracted from their host 2da .ZIP file, edited, and then placed into the "\Override" directory to provide end-user modifications to the game. Care must be taken with the use of such modified files as official patches often change the format of these files.
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