.idx

File Type 1 Generic IconIndex File
File Format Standard
Usage Referenced by an application; not meant to be opened manually
Rank ★ ★ ☆  Average
Description

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.

Open With
Windows

IconESRI ArcGIS for Desktop

IconICQ

Updated 2007
File Type 2 Generic IconNavigation POI File
File Format Proprietary (VDO Dayton)
Usage Referenced by an application; not meant to be opened manually
Rank ★ ★ ☆  Average
Description

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.

Open With
Windows

IconTransfer to a VDO Dayton device

Updated 2007
File Type 3 Generic IconOutlook Express Mailbox Index File
Rank ★ ★ ☆  Average
Description

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.

Open With
Windows

IconMicrosoft Outlook Express

Updated 2007
File Type 4 Generic IconHMI Historical Log Index File
Rank ★ ★ ☆  Average
Description

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

Open With
Windows

IconWonderware InTouch

IconWorkSmart Automation ReportBuilder

Updated 2007
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