The extension .jpeg tells us the file is an image file
The file extension tells about the type of file, with the extension three letters. For Eg:- *.txt -- text file *.exe-- executable file
The extension. It tells Windows what kind of a file it is. For example, a file with the ".doc" extension is a Microsoft Word Document.
The file extension is .docx.
its an extension for the file name which tells about the file type. but I just have a query, why most of the extensions are three lettered
What is the file extension What is the file extension
For most typical Word documents the extension is .docFor Excel workbooks (spreadsheets) the extension is .xlsIn general the file extension is the 3 letter/number "code" after the period in the complete file name that gives a hint as to what type of file it is. For example, in the file name resume.docthe word resume is the file's actual name and the .doc tells you that it is a document file.
File extension tells you more about the file type. Example a .pdf indicates that the file is a 'Print Document Format' file which can be opend using Adobe Acrobat or Adobe Reader. Look at the sites below for a list of file extensions:http://www.extensionpedia.com/html/list.htmlhttp://www.fileinfo.net/http://www.filext.com/The usual term used is "file extension" or sometimes simply "extension". Not all operating systems use extensions, and of those which do, not all of them are limited to precisely three letters.
file extension for video is 101
.html, .php, or .htm
file extension
The file extension is ".pages"
the extension of a batch file is ".bat"