I have just installed Windows 10 on a new computer. It has a program called Video Editor. When I attempt to import an avi video to the so called Storyboard timeline of Video Editor there is an error message over the avi clip: You need an extension to use this file.

When I attempt to play the files, there is only sound, no image.

Do I need an extension to use avi files? Where can one find the extension?

Suggestions welcome.