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 ...

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.

Introduction MP4 is one of the most popular and crucial video file formats. It is commonly used as a default format for recording videos on all devices.

If you receive Unsupported video type or invalid file path message in Internet Explorer when using Twitch, MyIPTV, Xbox or unsupported HTML video/audio format or player, see this fix.

One bright spot, said eEye, was that because Winamp does not open MP4 files embedded in a Web site, attackers would have to dupe users into launching the malicious file.

One bright spot, said eEye, was that because Winamp does not open MP4 files embedded in a Web site, attackers would have to dupe users into launching the malicious file.