File Extension Library

.IDX File Extension

  • Category: Misc Files

What is an .IDX file?

.IDX file extension has been classified as Misc Files.

.IDX is Movie Subtitle File

An IDX file is a data file used by various DVD playback programs to display subtitles. It contains the subtitle text as well as cue points for when each subtitle should be shown during the movie timeline. IDX files are saved with a corresponding video file, such as an .AVI or .MKV file.

IDX files are similar to .SUB files, which are also used to store subtitles for videos. An IDX file is typically accompanied by a SUB file and the video file. They will also all bear the same filename.

List of all softwares that can open the Movie Subtitle File
CyberLink PowerDVD 17
VideoLAN VLC media player
URUWorks Subtitle Workshop
VideoLAN VLC media player
VideoLAN VLC media player
J2 Interactive MX Player
File Type 2:

Navigation POI File

Developer by: VDO Dayton Category: Data Files

Contains points of interest (POI) for a VDO Dayton GPS portable navigation device (PND); includes a header and a set of POIs; each POI consists of a 3 byte index, then 8 bytes for the coordinates and 46 bytes for name and type.

IDX files can be transferred to VDO Dayton PNDs via USB.

File Type 3:

Index File

Category: System Files

Stores an index of files used by various programs; used by search functions to speed up searches; once a hard disk, directory of files, or database is indexed, the data can be searched and sorted more efficiently.

Used by Microsoft FoxPro, Corel QuickFinder, ESRI ArcView, ICQ, and other programs.

List of all softwares that can open the Index File
ESRI ArcGIS for Desktop
File Type 4:

HMI Historical Log Index File

Category: Data Files

Index for log files created by InTouch Human-Machine Interface (HMI) software or ReportBuilder with ODBC Connector pack for InTouch; used for running reports from collected data

File Type 5:

Outlook Express Mailbox Index File

Category: Text Files

Stores an index of mail messages stored in an Outlook Express mailbox (.MBX file); should be located in the same folder as the mailbox files; required for importing old Outlook Express mailboxes into Outlook Express 5 or later.

List of all softwares that can open the Outlook Express Mailbox Index File
Microsoft Outlook Express

How to Open .IDX file on different platforms

Open .IDX File on Windows

  • Right-click a .IDX
  • Left-click "Open With" > "Choose another app"
  • Select the program that opens .IDX file and Select check box "Always use this app to open .IDX files" Press "Ok"

Open .IDX File on Mac

  • Right-click (or Ctrl + Left-click) the .IDX file
  • Click "Open With" > "Other.."
  • Then choose another program from the app list and press "Open"
  • Select check box "Turn on" for "Always open in app"

Open .IDX File on Linux

Right click on the .IDX file, choose "Open with" and select a program from the list above

Open .IDX File on iPhone

Select a file. If you don't see an application to open the .IDX file, tap "Share" and choose the right app.
Method 2
Save the file. Then open the app «Files». Touch and hold the file, then release your finger. You will see a black menu bar. After that tap "Share" and select an application.

Open .IDX File on Android

Tap the Settings icon on an Android smartphone, then select «Applications». Click the Settings icon in the upper right corner of the screen, to change the default apps.
If you want to open, edit, save or even convert .IDX files on Android, then your best bet is to download one of the dedicated apps available on Google Play.

How to fix problems with .IDX files

  1. You need to update the application that you normally use to open .IDX files. Only the latest version of the software supports the current .IDX file format
  2. You need to check the .IDX file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)