Windows Essentials Codec Pack，或简称为WECP是一个很全面的音频和视频编码解码包，可以支持99%的多媒体文件。
Windows Essentials Codec Pack, or WECP for short, is one of the most comprehensive collection of Media Codecs, Filters, Splitters and other tools that will enable you to play 99% of all the movies, music and flash files you download off the internet. WECP also includes a set of powerful filters that can enhance the video quality as well as audio quality and it comes complete with an automatic update service that will keep your computer up-to-date with the latest software upgrades as soon as they become available.
WECP is clean and compact, it has no spyware / adware / or viruses, it’s easy to use and even easier to install / uninstall and it’s published under the GNU GPL open source license so it’s 100% free. But more importantly, it was especially designed to fix the many errors and software conflicts caused by other codec packs which routinely install obsolete or overlapping codecs, and it’s guaranteed to keep your to keep your computer up-to-date with the latest software upgrades.
官方网站：www.mediacodec.org
更新日志：Changelog
系统支持：Windows 2000, XP, Server 2003, or Vista
Download：
Direct link (WECPSetup.exe，8.74MB)；
Download from FileForum；
Download from Download.com
Download from Softpedia.com