The best programs for XviD.
K-Lite Codec Pack
The version of Windows Media Player included in Windows 7 and Windows 8 supports many video file formats by default, but despite this it often happens to download videos from the Internet and find yourself in the presence of an incompatibility warning from Microsoft's media player. K-Lite Codec Pack is an all-in-one solution to this problem that packs all of the codec needed to view all major video and audio file formats (including XviD) on all editions of Windows, even Windows XP where Windows Media Player is even less equipped to play files downloaded from the Net. Download from here.
When you are unable to play videos in XviD format on your computer and you don't want to waste time downloading and installing codecs, the best solution is VLC. As is now well known, VLC is a universal media player compatible with Windows, Mac OS X and Linux that allows you to play all major audio and video file formats (including online streaming streams) without the need for external codecs. It includes a huge range of advanced features and is completely in Italian. Download from here.
As its name suggests very easily, MediaInfo is a free application that allows you to find out the technical details of multimedia files. Using it, it is possible to know resolution, bitrate, codec used for encoding and much more on many different types of video files (including those in XviD). It is very easy to use, making it very useful in cases where you are unable to play or edit a video and want to find out the nature of the problem. It is compatible with Windows and Mac OS X. Download from here.
VirtualDub It is one of free video editing programs for the most powerful and flexible MPG and AVI (therefore also XviD) files. Despite being very compact and light, it incorporates all the basic editing tools (editing, cutting, joining and splitting of videos) plus a huge range of filters that allow you to adjust the properties of the videos (colors, brightness, etc.), resize frames and apply special effects to movies quite simply. It does not require installations to be used and is compatible with all major versions of Windows. Download from here.
FormatFactory is a terrific free multimedia file converter that allows you to convert all major video file formats together (and not only). It is completely in Italian and thanks to its extremely accurate user interface it is easy to use even for less experienced users. This does not preclude the fact that it allows you to finely adjust the output settings of the converted files. It fully supports the XviD format and also allows you to extrapolate audio tracks and frames from videos. Download from here.
Media Player Classic Home Cinema
Media Player Classic it's a small one free media player (and open source) which harks back to the look of old versions of Windows Media Player. Apart from the aesthetics, it has nothing to do with Microsoft's multimedia player and offers a practical and fast solution to play all the main video file formats, even on PCs that are no longer the first hair. It includes many advanced settings that allow you to fine-tune the quality and modes of video playback. Download from here.