What Is .idx Extension Direct

The file extension is a generic extension used by several different programs, but its core purpose is almost always the same: to index data for faster searching or access.

Only keep .idx files that came with a video file ( .avi , .mkv ) or a DVD folder you created yourself. Delete any .idx file that appears alone in an email or download.

Think of it like the index at the back of a textbook. The textbook's content (the actual data) is one file, and the index (the .idx file) tells the software exactly where to find specific terms without scanning every page.