Check out the Jakarta POI library. It can open Word and Excel for sure. I don't know about Powerpoint, but the site might give you starting points for further research.
You can extract it but after giving my 7000 Rs + Chetan's 1100 Rs + Canteenwala's 350 Rs + Valid's Nokia Mobile Charger that you have borrowed from them.
First you return what you have extracted from them, then you try to extract content from PPT. [ September 05, 2005: Message edited by: Amol Chavan ]