FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Answer: The file extension determines which program is used to open the file as well as what icon should be displayed for the file. It also helps you see what kind of file a certain document is by just looking at the filename.

Detailed explanation-2: -Extensions tell your computer which application created or can open the file and which icon to use for the file. For example, the docx extension tells your computer that Microsoft Word can open the file and to display a Word icon when you view it in File Explorer.

Detailed explanation-3: -The extension is a three-or four-letter abbreviation that signifies the file type. For example, in letter. docx the filename is letter and the extension is docx. Extensions are important because they tell your computer what icon to use for the file, and what application can open the file.