They are short for "Excel Spreadsheet."
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
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.
XLS is the shorthand for Microsoft Excel file extension. A file extension is the group of letters following a period in a file name, denoting what kind of file it is.
It is a batch command file.
It is a batch command file.
The letters at the end of a file name are called the file extension. They typically indicate the file type and help the operating system determine which program should open the file. For example, a file named "document.txt" has a ".txt" extension, signifying that it is a text file. File extensions can also include formats like ".jpg" for images or ".pdf" for documents.
A file name is the main name given to a file, such as document.docx. The file extension, represented by the characters after the dot, indicates the type of file and helps the operating system identify which software to use to open the file. For example, in document.docx, ".docx" is the file extension indicating that it is a Microsoft Word document.
The file extension. It comes after the file nice, after the last dot in the name. For example someTextDocumet.txt has the extension TXT for plain text. The program that created it is most likely the default one for opening it.
8 characters a decimal the 3 letters for extension. 8.3
The main project file has a VBPROJ extension. This is also a file with the same name as the main project file, but with an SLN extension. The SLN extension is a solution file.
. (Dot)
File extension.