.CDX File Extension

Compound Index File

Developer Microsoft
3.9  |  106 Votes

What is a CDX file?

A CDX file contains an index of files or other data stored in a database. It is similar to a compact index (.IDX) file, but the leaf nodes at the lowest level of a compound index point to one of the tags in the index. CDX files were introduced in version 2 of Microsoft Visual FoxPro, which is a database management program for Windows.

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The compound index is the native database index format used by Visual FoxPro. There are two types of CDX files:

  1. Structural CDX file - Automatically opened and maintained by Visual FoxPro when the table is accessed and requires exclusive use of the table.
  2. Non-structural CDX file - Not opened or maintained automatically by Visual FoxPro when the table is accessed and new records are added but does not require exclusive use of the table.

NOTE: Visual FoxPro was discontinued in 2007.

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Programs that open CDX files

Alpha Five Table Index File

Developer Alpha Software
3.9  |  14 Votes

A CDX file may also be an index file utilized by Alpha Five, an IDE for web application developers. It contains table index data referenced by Alpha Five to find table records and is created when index fields in the table are defined and intended to order lists in your data file. CDX files can only hold index names up to ten characters long with no spacing and are similar to .DDX, .ALX, and .ASX Alpha Five index files.

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When backing up your data, verify that the CDX file is being saved as well. Otherwise, when the .DBF and .FPT file data is only restored, the CDX file will hold lists from old data and Alpha Five will have to create new lists for the restored data, which may take time.

NOTE: In 2013, Alpha Five became Alpha Anywhere.

Common CDX Filenames

[Name of your table].cdx - When a table is created and the index field is defined, the CDX file will be created with the same name as your table.

Programs that open CDX files


CorelDRAW Compressed File

Developer Corel
3.3  |  19 Votes

File created by CorelDRAW, a vector-graphics editing program included with the CorelDRAW Graphics Suite software package; contains a compressed .CDR drawing file; used to reduce the storage space required for a drawing.

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CDX files are useful for sending smaller files over email, or for archiving drawings on external media.

Programs that open CDX files


ChemDraw Exchange File

Developer PerkinElmer
3.1  |  14 Votes

Chemical information file created by ChemDraw, a molecule editing program suite for Macintosh and Windows platforms; stores molecular data in a tagged binary format; used for storing accurate chemical drawings.

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CDX files store information such as atoms, bonds, fragments, arrows, and text.

The CDX format is the native format used by ChemDraw. Another format called CDXML (.CDXML files) is used for exporting and exchanging CDX data in an XML format.

Programs that open or reference CDX files


ConceptDraw DIAGRAM XML Document

Developer Computer Systems Odessa
2.6  |  5 Votes

A CDX file may also be an XML diagram file created by CS Odessa ConceptDraw DIAGRAM, a technical drawing program for amateur and professional users. It stores the XML version of a binary .CDD file, which users often save to transfer drawing information in an XML exchange format because it is easier to read than the binary version.

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Screenshot of a .cdx file in CS Odessa ConceptDraw DIAGRAM 16
CDX file open in CS Odessa ConceptDraw DIAGRAM 16

ConceptDraw DIAGRAM is a diagramming application that creates various types of drawings, from sports positions on a playing field to the flowchart for software development. CS Odessa developed the CDX XML-based format as an alternative to the CDD binary format.

How to open a CDX file

You can open CDX files with CS Odessa ConceptDraw DIAGRAM in Windows and macOS. To open a CDX file, select File → Open.

How to convert a CDX file

CS Odessa ConceptDraw DIAGRAM can convert CDX files to various file types, including the following formats:

  • .CDD - ConceptDraw DIAGRAM Document (Legacy)
  • .CDDZ - ConceptDraw DIAGRAM Document
  • .PPTX - Microsoft PowerPoint Presentation
  • .VSDX - Microsoft Visio Drawing
  • .VDX - Visio Drawing XML File
  • .JPG - JPEG Image
  • .PNG - Portable Network Graphic
  • .SVG - Scalable Vector Graphic
  • .PDF - Portable Document Format File
  • .SWF - Shockwave Flash Movie

Programs that open or reference CDX files

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