Pegasus Mail data
File type: Various data file
A CNX file is an internal data file used by Pegasus Mail for Microsoft Windows.
It stores a final-form version of a message while the message is being read in the Queue Manager.
Found 2 different file type records with the same cnx filename suffix.
File type category:
Various data file
Date updated: October 12, 2026
Pegasus Mail, developed by David Harris, is an email client for Microsoft Windows. CNX files are ancillary files that Pegasus Mail creates while handling messages in its queue.
A CNX file is created when a final-form version of a queued message is read in the Queue Manager. It is normally deleted automatically when the message is closed, so it is not intended to be a permanent user document or an interchange format.
Open the file only through Pegasus Mail on Microsoft Windows. The program creates and uses CNX files internally when reading queued messages; they are not intended to be opened as standalone documents.
CNX files are internal Pegasus Mail data files and are not intended for conversion. If message content must be retained in another format, open the message in Pegasus Mail and use the program's available message-saving or export functions instead.
Software applications that handle other tasks involving cnx files:
Microsoft Windows
File type category:
Various data file
Date updated: November 4, 2026
IBM Rational XDE was an integrated development environment from IBM for software development and modeling. It was available for Microsoft Windows, Unix and Linux.
The cnx file stores data associated with Rational XDE. It is an internal software data file rather than a general-purpose document.
Open a cnx file with IBM Rational XDE on a compatible installation. The file may need to be accessed through the relevant Rational XDE project or workspace rather than opened as a standalone document.
Rational XDE is legacy software, so a current general-purpose application may not be able to open this file.
If the associated project can still be opened in IBM Rational XDE, use the software's available project or model export features to preserve the relevant data in another format.
Software applications that handle other tasks involving cnx files:
Multiplatform
Rational XDE
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