Computers know which programs to use for each file based on the files extension. The last part of the filename, the part that starts with the . is the extension. For example, in the filename ...

Every file that we have saved on our computers has a particular extension. The file extension is added at the end of the filename followed by a dot (.). It tells the operating systems about the ...

I have tried it on Microsoft Word, Microsoft Excel, and Microsoft Paint; and I was able to save the file with no extension. Read: How to batch rename files and file extensions. How do I save a ...