.IDX File Extension
File Type 1Movie Subtitle File
What is an IDX 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.
File Type 3Index File
.IDX File Association 3
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.
File Type 4HMI Historical Log Index File
.IDX File Association 4
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 5Outlook Express Mailbox Index File
.IDX File Association 5
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.