KNN file format description

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

1 filename extension(s) found in our database.

.knn - Clarion Database Key Data

The KNN data files are related to Clarion. The KNN file is a Clarion Database Key Data. Clarion is a commercial, 4GL, multi-paradigm, programming language and Integrated Development Environment (IDE) from SoftVelocity used to program database applications.

Data files
- / -
Clarion Database Key Data related extensions:
Clarion for Windows Application
Clarion App Backup
Clarion for DOS Source Code
Clarion Source Code
Clarion 7 Project
Clarion for Windows Embed Points Data

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

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

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

kbn, kmn, knb, knh, knj, knm, mnn, nn

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Assetto Corsa Car Data
CDE Japanese Kanji Data
iWork Keynote Macro
TeamSpeak Keybinding
Microsoft Money Cache Data
Keyman Developer Keyboard Source File

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 .knn file format, then write to us! >> KNN file