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 ...

When you double-click on a file in Windows 8, Windows will automatically open that file using a program that has been associated with that file's extension. There may come a time, though, that you ...

You're probably aware that most files have an extension such as TXT or EXE after the file name, even though these are not always displayed in Windows. File extensions are how Windows knows what to do ...

BearPup sometimes wants to open a file in one program, and other times open it in another. He asked the Answer Line forum for an easy way to do this. Windows uses a file’s extension–the part of the ...

TUAW reader David wrote us to ask how he could view .erb files (Rails development) in Quick Look. The fact is, there are a lot of plain-text files with extensions that Quick Look doesn't recognize. It ...