A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...

What about some kind of a extension database? I am thinking of a simple text file that can be appended by each software program upon install to the OS that will state what the file extension is by ...

I can't quite figure it out. Personally, I would be lost without file extensions. How do you know what program to open files up in? How do you tell the difference between pictures and text files?