File extension

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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:

  • TXT files are text files
  • JPG are picture files in the JPG format
  • MP3 are music files in the MP3 format
  • DOC are documents in Microsoft Word format
  • ODT are Open Document text files

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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