Opening a COV File

The COV file type is primarily associated with PHPUnit.

COV	File extension: COV
	File type:	Data file

What is a COV file?

COV files mostly belong to PHPUnit. COV files are used by various programs to store different types of coverage data. They are not a single standard format.
Common usages include:

Code Coverage Data: Many tools, such as PHPUnit, BullseyeCoverage, and Cobertura (which sometimes use UTF-16 (LE) encoding), create COV files to record which parts of code have been executed. This helps developers review test effectiveness.

GIS Coverage Maps: Certain COV files (e.g., those linked with Zulu 14) hold geographical coverage data used in GIS systems.

Fax Cover Pages: Some COV files store fax cover page information generated by Fax Cover Page Editor.

Encrypted eBooks: In a few cases, the COV extension is used for encrypted eBook files managed by Adobe Digital Editions.

Hardware Coverage Data: Tools like Coverity Integrity Manager produce native Xilinx coverage data files, useful in analyzing hardware design coverage.

Covariance Matrices: MATLAB sometimes uses COV files to store covariance matrix data for statistical and engineering analysis.

How to open and view them:
Check the software that created the file. You can often open a COV with a simple text editor to view the raw content. However, to correctly interpret the data, use the intended application, such as a code testing tool (like PHPUnit), a GIS viewer, Adobe Digital Editions, or MATLAB, depending on the file's origin. For more details on specific formats, you may refer to related webpages such as Black Duck for Cobertura or MATLAB.
FilExt.com tip: Note that these files vary in internal structure. Inspecting the file header or content can offer clues to which application created it.

How to open COV files

You need a suitable software like PHPUnit to open a COV file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your COV file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a COV file directly in the browser:. Just drag the file onto this browser window and drop it.

Online COV Text Viewer

Choose your .cov file to analyze

or drag and drop it here

Online File Viewer

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COV file format:

If you can determine the file format, the associated program can also be determined. The initial characters of a file are called signature, sometimes also referred to as "magic bytes". The signature can be used to infer the file format. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. If there are problems opening a file, you must first determine the file format used. Our analysis of the COV files produces the following result:

The COV file extension is not widely used. Such a file is used by many programs, each with its own file format. The two most popular formats are as follows:

• 20% of all COV files have the same signature FAXCOVER-VER005w. They consist of illegible, cryptic characters. A typical file size is 10 KB. The files contain the following words: EMF and FAXCOVER-VER005w. A common filename is confident.cov or GENERIC.cov. Files like these are about page, nocallednum and cover.
• 10% of all COV files start with the bytes F7 08 00 00 5A 55 4C 55 20 31 34 crucial for this file format. These files are binary files, so they do not contain text, but only cryptic characters. COV files are between 700 KB and 23 MB in size. The following keywords are characteristic: ZULU 14. Files like these are about house.

All other COV files (70%) have no consistent format, the following 7 formats exist: BullseyeCoverage. Often described as applied, indipendenti or epub. You can get all the details of your COV file by dragging it onto this page or by clicking the button "Choose your .cov file to analyze" above.