Sometimes, scanning software creates temporary .idx files. If a file is located in a "Temp" folder or a cache folder (like C:\Windows\Temp ), it is likely a temporary index. These can usually be deleted to free up space, though they may be regenerated automatically by the software later.
Here is the Golden Rule of .IDX files:
The .idx extension is a , not a standard document or image file. To open it, you need to know whether it belongs to a video, a database, or an email program. For 90% of home users, the answer is VLC Media Player combined with a matching .sub file. For the remaining cases, leave the file alone—it is working as intended for its parent application. open .idx files
If you are desperate to peek inside the file contents to identify it: Sometimes, scanning software creates temporary