This guide covers the three most common scenarios: Subtitle files, Movie Index files, and Database files.

You generally do not "open" this file manually like a document. Instead, the video player reads it automatically.

This is the most common use for .idx files. When you download a movie, you might see a .sub file and a .idx file with the same name. The .sub file contains the actual images of the subtitles, while the .idx file tells the video player exactly when to show them.

That afternoon, his boss called him in. "The architect," he said, "wants to know if you can recover the rest. She's offering double. What do we tell her?"

PowerDVD, WinDVD, various DVD players.