Working with Files
Photoshop can open and save images in many file formats. Formats are ways of saving the information in a file so it can be used by other applications, printed, or placed on a Web page for use on the Internet.
In the Windows world, file formats are defined by three-letter extensions to filenames, such as .doc for a word processing document and .bmp for a bitmapped graphic. Because you can toggle off the extension codes in Windows, you actually might not see extensions to known file types. Rest assured, they are there.
Macintosh users really only need to use file extensions if they're sharing files with someone on a PC, or are posting them on a Web page. You can toggle Append File Extension on or off in the Preferences→File Handling ...
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