CNB file format description

Many people share .cnb files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .cnb file can be edited, converted or printed with. On this page, we try to provide assistance for handling .cnb files.

2 filename extension(s) found in our database.

.cnb - Pool Of Radiance Game Data

The CNB game data files are related to Pool of Radiance. The CNB file is a Pool Of Radiance Game Data. Pool of Radiance is a role-playing video game developed and published by Strategic Simulations.

Pool of Radiance
Game Data files
- / -
Pool Of Radiance Game Data related extensions:
Middle Earth: Shadow of Mordor Game Data
Homeworld Unicode Strings Data
Descent 3 Outrage 3D Model
Metroid Prime Texture Data
RPG Maker VX Ace Data File
Quake 3 Arena Effects Data

.cnb - Pegasus Mail Noticeboard Message

The CNB data files are related to Pegasus Mail. The CNB file is a Pegasus Mail Noticeboard Message. Pegasus Mail is a donationware (previously freeware) e-mail client.

Pegasus Mail
Data files
- / -
Pegasus Mail Noticeboard Message related extensions:
Windows Netlogon ChangeLog
Integrative Genomics Viewer Data
HP Share to Web Upload Folder Data
ASAM Transfer Format XML Data
Unity 3D Animation Data

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

Can't open a .cnb 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 .cnb file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

cb, cbb, cbn, cgb, chb, cjb, cmb, cn, cnf, cng, cnn, cnv, dnb, fnb, nb

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

SGI Scalable Graphics Compositor Combination File
CryptoNG Encrypted File
Microsoft Document Converter
DB/TextWorks SQL Textbase Structure Definition
Tekla Structures Conversion File
ChessBase Search Booster

Operating systems currently supports the following operating systems:

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 have useful information about the .cnb file format, then write to us! >> CNB file