CNU file format description

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

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

1 filename extension(s) found in our database.

.cnu - iiV Lookup Script

The CNU data files are related to iiV. The CNU file is an iiV Lookup Script. iiV (formerly CNUViewer) is a brain imaging data display tool developed by the Cognitive Neuroimaging Unit. The iiV seems to be no longer supported.

Data files
- / -
iiV Lookup Script related extensions:
iiV Lookup

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

Can't open a .cnu 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 .cnu 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:

cbu, chu, cmu, cn, cni, cnj, cnk, cu, snu, vnu

Is it possible that the filename extension is misspelled?

There is a possibility that the .cnu 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 .cnu:

CMU Window Manager Bitmap
1C:Enterprise Configuration Update Data
Pool of Radiance Game Data
Andrew Toolkit CMU Data
Dead Space Game Audio Data
Microsoft Dynamics GP Chunk 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

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

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