File Extension

In Windows, file names have three or four letters extension after the dot. For example myfile.xls This is called the 'file extension'

The letters indicate what kind of application created it. There are many common file extensions. For example:

.xls Excel
.doc Word
.ppt PowerPoint slides
.bmp Bitmap image
.pimage Paint Shop Pro image
.mpeg A video file in the MPEG format
.vbs Visual Basic Script

The file extensions help software work out the format it expects to handle.

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