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 ).
You cannot simply double-click an .idx file. You need to identify what kind of .idx file it is first. 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. If you’ve come across a file with the