File Extension

.xls

A Excel Document, or XLS, was the standard file format that Microsoft Excel would saved files as. This was changed to .xlsx starting with Excel 2007.

.txt

A text file is a file that contains textual data without any formatting.

What is file naming?

a method of naming files that a group of users utilize to help better manage their shared files.

File extension

the letters immediately shown after after the last period in a file name.

what are the 7 rules to a file name?

-Use short, simple file names. -Use file and folder names that describe the content accurately. -Use underscores instead of spaces in file names. For example: descriptive_essay -Avoid using non-alphanumeric characters in file names. Avoid: * : \ / < > | " ? [ ] ; = + & £ $ , . -If using a date in the file name always state the date back to front "YYYYMMDD" -When including a personal name in a file name give the family name first followed by the initials. -Avoid using words such as draft or letter as the start of a file name.

What are some examples of file extensions?

.txt, .doc, .wav, .xls .mp3, etc.

.wav

A WAV, or Waveform Audio File Format, is a audio file format used to store audio on PCs

.doc

A Word Document, or DOC, file is the extension that Word would save its documents.

.m

An MP3 file is the most common file format used to store digital audio for use on computers and digital media devices.

Operating System

An operating system knows what programs to use in order to view, print, or edit a particular file by looking at its file extension.

How can an operating system do this?

It is able to do this because each operating system has in its configuration a default mapping between a particular file extension and a particular program.