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H file extension

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

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

✅ C Header File

C language header file. Information that is needed by several different files or functions is collected into a header file. A header file contains C-language definitions and structures. Centralizing information into a header file facilitates the creation and update of programs.
H format description not yet available
Application: -
Mime-type: text/plain
Magic number: -
Magic string: -
Sample: -
H aliases:
H related links:
H related extensions:
C Source Code

C++ Source Code

Visual C++ Dialog

Visual C++ Import Library

Microsoft Visual Studio Workspace Options

Visual C# .NET Class

Visual Studio Resource Script



Haskell Source With C Hooks

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

🔴 Can't open a .h 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 .h 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 .h file extension, write to us!

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