Monday 28 September 2015

File Extension

File Extension

A file extension is the ending of a file that helps identify the type of file in Operating systems such as Microsoft Windows. In Microsoft windows, the file extension is a period that is often followed by three characters, but may also be one, two, or four characters long. For example, the file-name
“myfile.txt” has an extension of “.txt”, which is a file extension associated with text files.
In the example above, the first file shown in explorer is “regedit.exe”, “regedit” is the name of the file, and “.exe” is the file extension that identifies this file as an executable file. The next file “RtlExUpd.dll”, which is a DLL file and another example of a file, and finally the last two files are log files. As can be seen in this example, by having file extensions you can quickly identify the type of file and have a better idea of how that file may be opened.

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