.NET PDF and Word viewers

Microsoft Word as you should've known is virtually proprietary (meaning the vast majority of the files are unreadable because you don't know how to read them). Most PDFs can be read, and Adobe will tell you how to do it. Just follow their extremely complicated directions on their file format specifications. There are open source implementations for PDF reading, but I doubt any of them are complete. So, if you want complete PDF and Word support, you probably have to go buy the components.