CNO file format description

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

1 filename extension(s) found in our database.

.cno - TSP-INet Server Error Description Data

The CNO data files are related to TSP-INet Server. The CNO file is a TSP-INet Server Error Description Data. The Telecom Service Providers (TSP) INet Server is a centralised database system to which the Swiss TSPs connect via the Internet.

TSP-INet Server
Data files
- / -
TSP-INet Server Error Description Data related extensions:
Cimagraphi Mill Data
The Master Genealogist Visual Chart Data
The Bat! Address Book
TrueRTA Single Memory Data
Adlib Express Server Data
Corel Paint Shop Pro Contour Preset

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

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

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

cbo, cgo, cho, cmo, cn, cni, cnk, cnp, co, con, dno, fno, nco, sno

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

ALEID2000 Contour Data
Chord Pro Chord
DriveTools SP DriveExecutive Parameters
Train Simulator Model Identification
Bentley CONNECT Project
Canoco Project

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

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

If you have useful information about the .cno file format, then write to us! >> CNO file