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The Tool Kit install application fails claiming "Dungeon Siege is not installed" (which is not true). A registry entry is required. I do not know if this always arises on Windows 7, or if it is the fault (in my case) of a third party performance tuner over-zealously cleaning the registry. I found fix instructions in Jural's post 30 Nov 2012 to Steam Community Forums, http://steamcommunity.com/app/39190/discussions/0/882959527674476138/

[start of copy and paste]
Open note pad, for windows 7 paste:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft Games\DungeonSiege\1.0]
"EXE Path"="C:\\My Steam Install\\steamapps\\common\\dungeon siege 1"

Be sure to change "My Steam Install" to actual install path of your steam.

Save file as "DungeonSiege.reg" or anything .reg, once saved doubble click file and say yes to install.

Install gmax so siege editor does not error, then install siege editor. Siege editor will error once when starting, just ignore.

[end of copy and paste].
I believe the error to ignore is about unknown video card.