CN3 file format description

Many people often share .cn3 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 .cn3 files. To address this issue, we have created this page to offer assistance and guidance on handling .cn3 files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .cn3 files.

Our aim is to simplify the process and promote seamless use of the .cn3 file format.

1 filename extension(s) found in our database.

.cn3 - Cn3D Data

The CN3 configuration files are related to Cn3D. The CN3 file is a Cn3D Data. Cn3D (see in 3D) is a helper application for your web browser that allows you to view 3-dimensional structures from NCBI's Entrez Structure database.

Configuration files
- / -
Cn3D Data related extensions:
Calc Init Script
MarketPlace Pro Configuration
BlueZone UTS Display Settings Data
VMware ACE Virtual Machine Policy File
WinAMP Equalizer Auto-load Presets
C Shell Startup Configuration File

Naturally, other applications may also use the .cn3 file extension. Even harmful programs can create .cn3 files. Be especially cautious with .cn3 files coming from an unknown source!

Can't open a .cn3 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 a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .cn3 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. By providing this list, we aim to assist users in finding the correct information more easily and improving their overall search experience on our site.

These misspellings were the most common in the past year:

c3, cb3, cg3, ch3, cm3, cn, cne, cnr, cnw, dn3, fn3, n3, nc3, sn3

Is it possible that the filename extension is misspelled?

There is a possibility that the .cn3 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 .cn3:

POV-Ray for Windows Scenes Advanced Newltpot Data
Samsung Kies 2 Backup Data
DSC Crossover Network Tuning Data
RMCProfile Nitrogen Carbon Neighbours Data
CliBench Mk III Data
netCDF Data

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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