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GCNO file extension

The table below provides useful information about the .gcno file extension. It answers questions such as:

  • What is the .gcno file?
  • What program do I need to open a .gcno file?
  • How can the .gcno file be opened, edited or printed?
  • How can I convert .gcno files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Gcov Metadata File

GCNO file is a Gcov Metadata File. Gcov is a test coverage program. Use it in concert with GCC to analyze your programs to help create more efficient, faster running code and to discover untested parts of your program.
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
GCNO aliases:
GCNO related links:
GCNO related extensions:
C Source Code

Gcov Data File

Visual C++ Preprocessed Source

INTERCAL Source File

D Source Code

Gcov Compiled Output

Other types of files may also use the .gcno file extension.

🚫 The .gcno file extension is often given incorrectly!

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

cno, gco, gno

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Genbox Family History Chart Options
G-code Code
GenoPro Genealogy Tree
TSP-INet Server Error Description Data

🔴 Can't open a .gcno 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 cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .gcno file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .gcno file extension, write to us!

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