An extension typically refers to a file name extension. This suffix is added to the end of a file name, indicating its format. For example, the .doc or .docx extension specifies a Microsoft Word document. The latter was introduced in 2007 and is a more modern version of the .doc format.

Apr 7, 2025 · What is a File Extension? A file extension or file name extension is the ending of a file that helps identify the file type in operating systems such as Microsoft Windows. In Microsoft Windows, the file name extension is a period often followed by three characters but may also be one, two, four, or more characters long. Example of a file extension.

Dec 17, 2017 · File extensions indicate the file format or file type. It is start dot (.) symbol and filename. File extensions consist of three or four characters, although in rare cases it could be two .Which are typically letters or digits. Such as .txt, .mp3, .pptx etc.

Mar 4, 2024 · Extension: Extensions are useful so that the operating system can check which type of file is being used. Metadata: This is the data that stores useful information about the file such as author name, license, etc. Interoperability: This feature enables multiple systems to use the same file format.

Nov 5, 2012 · A file extension (or simply "extension") is the suffix at the end of a filename that indicates what type of file it is. For example, in the filename "myreport.txt," the .TXT is the file extension. It indicates the file is a text document.

Jul 17, 2023 · File extensions help Windows, or other operating systems you're using, determine which program to use to open those types of files. Most file extensions, especially those used by common image, audio, and video formats, are usually compatible with more than one program you have installed.

Mar 3, 2025 · A file extension is the suffix of a computer file that an operating system uses to identify the exact file type. When executing the respective file, the file extension tells the operating system which software application to open, depending on the file type.

A file extension is a three- or four-letter identifier found at the end of a file name and following a period. These extensions tell you about the characteristics of a file and its use. In this lesson, we'll go over some examples of these extensions, as well as how to determine a particular file's extension. Examples of file extensions

File extensions are used by the operating system to identify what apps are associated with what file types---in other words, what app opens when you double-click the file. For example, a file …

File extensions are used by the operating system to recognise it in order to associate it with the correct program and also provide users with quick insight into the types of files they're working with.