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:
.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.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: File Extension