CNX file format description

Many people often share .cnx files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .cnx files. To address this issue, we have created this page to offer assistance and guidance on handling .cnx files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .cnx files.

Our aim is to simplify the process and promote seamless use of the .cnx file format.

3 filename extension(s) found in our database.

.cnx - IBM Rational XDE Component Instance File

The CNX data files are related to IBM Rational XDE. The CNX file is an IBM Rational XDE Component Instance File. Rational XDE is a graphical component modeling and development tool that uses the industry-standard Unified Modeling Language (UML).

Application:IBM Rational XDE
Category:Data files
Magic:- / -

IBM Rational XDE Component Instance File related extensions:

  • lav Liquid Audio Player Voucher Data
  • svndblib Altium Designer Subversion Database Library
  • olm Microsoft Office Outlook for Mac Database
  • pspselection Corel Paint Shop Pro Selection
  • qbmd Intuit QuickBooks for Mac Backup Data
  • pml Pegasus Mail Distribution List

.cnx - Trimble LM80 Data

The CNX data files are related to Trimble LM80. The CNX file is a Trimble LM80 Data. Trimble LM80 is a pocket-sized personal computer featuring the first data collection software created specifically for construction layout.

Application:Trimble LM80
Category:Data files
Magic:- / -

Trimble LM80 Data related extensions:

  • luar UltraDefrag Lua Report
  • mod CATIA Model Data
  • adm Addict Dictionary
  • delta Firebird SQL Delta Data
  • tp_print ThumbsPlus Print Scheme
  • eul Metrel Eurolink Pro Data

.cnx - Pegasus Mail v3 Message Data

The CNX data files are related to Pegasus Mail. The CNX file is a Pegasus Mail v3 Message Data. Pegasus Mail is a previously freeware, proprietary, email client that is developed and maintained by David Harris.

Application:Pegasus Mail
Category:Data files
Magic:- / -

Pegasus Mail v3 Message Data related extensions:

  • skindex Apple Mail Index Data
  • hti MXKEY HTI Data
  • catmaterial CATIA CATMaterial Data
  • btoa Ascii85 Encoded Data
  • usbz UltraMixer Sample Bank Data
  • dbg Altair FEKO UTD Debug Data

Be careful.

It is important to understand that the .cnx file extension is not limited to a particular set of applications. Other programs besides the intended ones can also use the .cnx extension to create files. This includes potentially harmful programs or malware that may generate .cnx files for various purposes. Be especially cautious with .cnx files coming from untrusted or unknown sources.

Can't open a .cnx file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize an extension, you receive the following message:

Select an app to open this .cnx file

To set the .cnx file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. Under the Default apps section, you will find various categories such as Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate, such as Photos for image files or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the desired app is not listed, click on More apps to see additional options or click on Look for an app in the Microsoft Store to search for apps in the Store.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set .cnx file association. Many applications can open .cnx files without requiring any specific file association to be set.

The .cnx file extension is often given incorrectly

Based on searches conducted on our site in the past year, we have compiled a list of the most common misspellings. These frequent misspellings can cause confusion and hinder search accuracy. Our goal in providing this list is to help users find the right information more easily and enhance their overall search experience on our website.

These misspellings were the most common in the past year:

cbx, cgx, chx, cmx, cn, cna, cnc, cnd, cns, cx, cxn, dnx, fnx, ncx, nx

Is it possible that the filename extension is misspelled?

There is a possibility that the .cnx filename extension is misspelled. To assist users in identifying potential errors, we provide a list of similar file extensions in our database.

Filename extensions similar to .cnx:

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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If you find the information on this .cnx page useful, please feel free to link to this page. >> CNX file