File extension

From Wikipedia, a free encyclopedia written in simple English for easy reading.

A file extension is a way of knowing what type of file it is, and what program it should be opened with. File extensions are usually three letters long and come after the name of the file.

Some examples of common file extensions are:

  • DOC files are usually opened in Microsoft Word
  • XLS files are usually opened in Microsoft Excel
  • PPT files are usually opened in Microsoft PowerPoint
  • PUB files are usually opened in Microsoft Publisher

You can change the program defaults so that the computer knows which program to open each type of file extension with.

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