H extension is related to C++ or Java header file. You can open h extensions with Borland C++, Visual C++ or Java languages.

To create codes with C++ or Java programming languages, header files are used for using prepared functions and libraries.  The extension of these files is .h. You can try to open .h files with Note Pad. To use these files, it is enough to call related file beginning of the code which you will write: 

For example C++ code:
#include <iostream>
#include <time.h>

What to use h

Borland C++ , Visual C++, Java, C builder languages

which page related to h file


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