File Types Explained

Welcome to, the information repository dedicated to files types.

What is a file type? A file type is quite literally the the type of the file, and this is indicated by the file extension which is the last few letters at the end of a file name that follow after the dot. For example, a file called "default.htm" has the file extension of "htm" which in turn indicates that the file is an HTML file.

To complicate matters, Microsoft Windows often hides the file extension, so if you are having trouble determining the file extension then consult our Frequently Asked Questions (FAQ) article "Help determining the file extension".

File types are also known as file extensions, and the two terms "file type" and "file extension" are often used interchangeably. But they are not quite the same - see the FAQ entry "What is the difference between a file extension and a file type?"

This file types repository is intended to help you to answer the common questions of:

There are a number of different ways you can navigate around this file type repository: is part of Explained.At - The Information and Knowledge portal.