Computer files are part of a framework for managing the data you create and store on your computer. When you create information in a program, such as a letter, you save that information in a file and assign the file a memorable name. When you want to work with the file at a later time, you can identify the file by its name and open the file in the program. Although the ins and outs of creating and using files differ somewhat among the Office programs, after you learn to work with files in one Office application, you will for the most part be able to work with files in the other Office applications. The skills you learn next will come in handy when you need to work with files in various Office programs.
Every program saves data in a particular file format that reflects how the program identifies, organizes, and interprets information. You can typically identify what program was used to create a file in two ways:
The file’s icon in a Windows folder window or a dialog box such as the Open dialog box identifies the program used to create the file. That is, all files created in a particular program use the same icon. Figure 3-1 shows the file icons for some of the key Office programs.
A three- to five-letter filename extension (such ...