If you look at apache POI, they have libraries for handling doc, ppt, xls, etc. There's also a poi-like toolkit for handling the new docx, pptx, etc file forma

If you look at apache POI, they have libraries for handling doc, ppt, xls, etc. There's also a poi-like toolkit for handling the new docx, pptx, etc file formats somewhere, but I forgot where. They're java libraries, but it's pretty easy to write some simple stand-alone conversion tools using them. If you need to convert a ton of files at a time and the JVM startup is killing you, you can try nailgun (http://www.martiansoftware.com/nailgun/ http://www.martiansoftware.com/nailgun/).