doc file: You need the Microsoft Word program, a free Microsoft Word viewer, or a program that can import Word files in order to view this file. To learn more about the free Microsoft Word Viewer, visit the Microsoft Word website.
zip file: This is a "zip" file (a compressed data file), and you will need a data compression utility such as WinZip to open it. Download the free utility - click here.
The Advanced Systems Format (ASF) is an extensible file format designed primarily for storing and playing synchronized digital media streams and transmitting them over networks. ASF is the container format for Windows Media Audio and Windows Media Video-based content. Detailed information about ASF in presented in the ASF specification.
The MP4 file type is primarily associated with 'MPEG-4'. Play MP4 files with various players such as QuickTime or RealPlayer.