What does the 3 letter extension at the end of a file name tell a computer?
The three letter extension at the end of every file name is for
windows to identify the file format. Some Common file extensions
are: .BAT -DOS batch file, .BMP - a bitmap picture image, .DOC
-Microsoft Word word processor file format, .EXE -Executable file,
.GIF - Graphic Image Format file,
.HTM or .HTML, .JPG - Joint Producers and Engineers of Graphics
file format, .PDF -Portable Document Format.