What are file extension or file types? File types are like embedded signatures, telling the operating system that this type of file can be opened by this  software or program and also to  associate with it properly.  A  file extension is one or several letters at the end of a filename. Usually three or four letters,  Filename extensions usually follow a period (dot) and indicate the type of information stored in the file.  One good example is “Warcraft III.exe” the [...]

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