CHECK file format description

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

1 filename extension(s) found in our database.

.check - CASTEP Check Binary

The CHECK data files are related to CASTEP. The CHECK file is a CASTEP Check Binary. CASTEP is a full-featured materials modelling code based on a first-principles quantum mechanical description of electrons and nuclei. It uses the robust methods of a plane-wave basis set and pseudopotentials.

Data files
- / -
CASTEP Check Binary related extensions:
CASTEP Cell Input Data
CASTEP Geometry Data
CASTEP Parameters Data

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

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

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


Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Microsoft Exchange Database Check Data

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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