The Microsoft AVI file format is a a multimedia container format used with applications that capture, edit, and play back audio-video sequences. AVI files contain multiple streams of different types of data, usually both audio and video streams.

More information about .avi extension: Wikipedia

Common .avi file type descriptions:

VLC media file (.avi)
Video Clip
Videoclip
Видеозапись
KMP - Windows Movie File

Applications, associated with .avi files

	MediaGet torrent client by MediaGet LLC
	µTorrent by BitTorrent, Inc.
	DivX Player by DivX, LLC
	Splash by Mirillis Ltd.
	IrfanView 64-bit by Irfan Skiljan
	AVS Media Player by Online Media Technologies Ltd.
	SMPlayer (Portable Edition) by Ricardo Villalba
	Haihaisoft Universal Player by Haihaisoft Limited
	MPlayer for Windows by KeyJ
	XBMC by Team XBMC
	Creative MediaSource Player by Creative Technology Ltd
	Windows Live Movie Maker by Microsoft Corporation
	VirtualDub
	www.napiprojekt.pl
	暴风影音5 by 北京暴风科技股份有限公司