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The K-Lite Codec Pack is a collection of DirectShow filters, VFW/ACM codecs, and tools. Codecs and DirectShow filters are needed for encoding and decoding audio and video formats.
The K-Lite Codec Pack is designed as a user-friendly solution for playing all your audio and movie files. With the K-Lite Codec Pack you should be able to play all the popular audio and video formats and even several less common formats.
Key Features:

The pack is suitable for both novice and expert users.
All components have been carefully selected for specific purposes.
It is not just a random bunch of stuff thrown together.
It is very user-friendly and easy to use.
Works great with Windows Media Player and Windows Media Center. But also with all other DirectShow players, such as Media Player Classic, BS.Player, ZoomPlayer, KMPlayer, and others.
The installation is fully customizable, meaning that you are able to install just those components that you really want.
The pack has many options, which allows you to tweak it to your own specific needs and preferences.
It is extremely easy to make a fully customized unattended installation with the integrated wizard.
It tries to avoid potential conflicts with other codecs installed on your computer. The installer is able to detect and remove over 100 different codec and filter packs.
It is a very complete package, containing everything you need to play your movies.
The pack has options to activate thumbnail generation in Windows Explorer for several popular video file formats, which are by default not thumbnailed in Explorer.
The pack automatically configures Windows Media Center to recognize all common audio and video file formats, so that such files show up in your media library.
This pack has a huge user base. This means that problems are found and resolved quickly.