Check out our guide on how to convert MP4 files to AVI, whether you use Windows or Mac OS X.

How to Play MP4 Files in Media Player. An MP4 file is an MPEG-4 video encoding used for viewing movies. It is a file compression format that provides a wrapper for video, audio and text.

I was recently sent some video clips in .mp4 file format and could not open them with Windows Media Player, which displayed a message saying the file was incomplete or corrupt. I tried various ...

How to Open MP4 Files in VirtualDub. VirtualDub is a free digital video application that you can use to make simple edits to footage. The program accepts digital video in the AVI, DIVX, MPG, MPV ...

Microsoft is making it easier to change your default file associations by adding a new search feature that lets you quickly find the extension you wish to modify.

When you export a Windows Live Movie to disk its default settings go out to an MP4 file. Windows Media Player on his computer does not play MP4 files.

Windows XP users, for example, typically run the operating system using an administrator account. One bright spot, said eEye, was that because Winamp does not open MP4 files embedded in a Web site ...