If you log-on as admin and go to Object Types under the Object categories, you'll see a list of file types that are standard within Intralink. I'm in 3.3, so it may be a little different in 3.2, but this should get you started in the right direction.
We are using 3.2, and I just recently added .dwg and .doc to INTRALINK so we can also store and track our autocad drawings. It appears to work well, however, we do not open autocad in a workspace (that does not mean it cannot be done, we just have not figured it out). What we do is to import the acad drawings into a workspace, then set folder, ...etc. To update your drawings you must make your changes on your harddrive and then re-import to the workspace, where you will get a warning that you are about to modify your workspace, which is good. Let me know if you have any probs. Doug Conner