File Extension Database

Open H File

H files are a common file extension found in a variety of programs and applications. Files with the .h extension are usually associated with C and C++ programming languages, holding header files that contain definitions for functions and variables used within a program. However, there are other types of H files, such as HydroCAD unit hydrograph files and HelpSpot templates. In this article, we'll explore some popular formats of H files, how to open them, and provide useful links for further information.

C/C++ Header Files

C and C++ programming languages widely use H files as header files. They contain function prototypes, variable declarations, and various code definitions, all of which are essential to the program's functionality. Programmers include these header files in the main C or C++ source files using a preprocessor directive, such as #include. This inclusion allows the main program to use the functions and variables defined in the H file.

Since H files are plain text files, you can open them using any text editing software, such as Notepad++ (, Visual Studio Code (, or even the basic Notepad application that comes pre-installed on Windows systems. To use these functions in your program, it is essential to include the corresponding H file within your C or C++ source file.

HydroCAD Unit Hydrograph Files

Another usage of H files is as Unit Hydrograph files in HydroCAD software. HydroCAD ( is a computer program used by engineers to model stormwater runoff and analyze drainage systems. H files in this context contain data used for runoff calculations and analysis.

To open these H files, you must have the HydroCAD software installed on your computer. You can click on the "Open" option within the software or simply double-click the file if HydroCAD is set as the default program for H files.

HelpSpot Templates

H files can also be found as templates within HelpSpot software. HelpSpot ( is a help desk software tool used in managing customer support requests. These H files typically contain HTML code and are used to customize the appearance of the HelpSpot application.

To edit or view these H files, you can use any standard text editor or an HTML editor, such as Adobe Dreamweaver ( or Sublime Text (

H File Important Information

As we have seen, H files can come in various formats depending on the software they are associated with. It is vital to identify the type of H file you are dealing with before attempting to open or edit it. Generally, these files are used for specific applications, and using the correct software to handle them is crucial.

Typical H application file locations:

  • "g:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe" /dde
  • c:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe /dde
  • "C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" /dde

Typical H mime types:

  • text/plain

Frequently used application names to open H files:

  • Microsoft Visual Studio 10.0
  • Microsoft Visual Studio 9.0

Frequently associated Windows objects:

  • VisualStudio.h.10.0
  • VisualStudio.h.9.0

How to Open H File on Windows

How to Open H File on Mac OS

How to Open H File on Android

If you downloaded a H file on Android device you can open it by following steps below:

How to Open H File on iPhone or iPad

To open H File on iOS device follow steps below:

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H file article translations

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