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If you don't have access to a server side scripting language it is virtually impossible to stop Internet Explorer trying to open stuff in MS Office.
Your best tactic would be very clear instructions that say (in big letters):
"Right Click on the filename you require, and then select "Save Target As..."
Adding target='_blank' to your links - for example...
<a href='something.ppt' target='_blank'>
...might provide some damage limitation.
If you do have access to some server side magic, you can send some headers that will force a download. A Google Groups search on "<your scripting language> force download" should bring up some examples.
So, start by downloading a browser: Mozzie, Opera, etc.
Then when you want to minimize bizarre side-effects, viruses, worms, and other pathological behavior, use the browser.
The only thing that puzzles me is: why do people ever want to _maximize_ BSEVWAOPB?