CN3D data
File type: Various data file
A .cn3 file is a CN3D data file created for use with the Cn3D molecular structure viewer.
It stores molecular structure information together with data used to display and work with the structure in Cn3D.
File type category:
Various data file
Date updated: October 16, 2026
Cn3D is a molecular structure viewer from the National Center for Biotechnology Information (NCBI). It displays three-dimensional biological structures and can combine them with related sequence and alignment information.
A .cn3 file can contain structure data and Cn3D-specific information such as display styles, viewing settings, and associated alignment data. This allows a structure and its presentation to be saved for later use.
The format is intended for Cn3D rather than as a general-purpose molecular-data interchange format. The linked Cn3D application is available for Microsoft Windows.
Open the .cn3 file with Cn3D on Microsoft Windows. Use Cn3D's Open command and select the file, or associate the cn3 file extension with Cn3D for direct opening.
Open the file in Cn3D and use its save or export commands when a suitable target is available. Cn3D-specific viewing styles, settings, or alignments may not be preserved in another format.
Software applications that can open cn3 files:
Microsoft Windows
Software applications that can edit cn3 files:
Microsoft Windows
Software capable of saving cn3 files:
Microsoft Windows
Software apps that create cn3 files:
Microsoft Windows
Software applications that handle other tasks involving cn3 files:
Microsoft Windows
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