How To Open .idx Guide

You cannot simply double-click an .idx file. You need to identify what kind of .idx file it is first.

If you’ve come across a file with the .idx extension and can’t open it, don’t worry—you’re not alone. The .idx extension is used by many different programs for different purposes. It is rarely a standalone file; it usually works alongside another file (like a .sub , .bak , or .dat ). how to open .idx

When in doubt, and try opening the other file in the folder. The .idx is almost always just a helper file. You cannot simply double-click an