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The tank files are the big data files on Dungeon Siege, and to be able to mod anything at all you will need to know how to extract and re-compile them.

Siege University

Dungeon Siege Resource System
What are tanks? What are bits? And how to I build one from the other? All that and some more is answered here.
Naming Key
Learn how to name your tank content and how to structure yor tanks.

Other Resources

How to Open and Create Tanks
Let's discuss some basics. Dungeon Siege stores game data in archives called "tanks" - a play-on-words from the company name, "Gas Powered Games". A similar play-on-words is done with template files, which are called "gas". Get it? Gas? Tank? Ha-ha, we're rolling with laughter, yes.

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