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 ...

A file extension, or file name extension, is the letters immediately shown after the last period in a file name. For example, the file extension.txt has an extension of .txt. This extension allows the ...

I was all set to put this “Windows Explorer Explained” series to rest for a while, but then reader Martin wrote in with a question that comes up a lot: in Windows 7, how do you reveal the hidden file ...

If you use VMware in virtually any of its flavors, then you've probably become familiar with the list of files created in each folder you create for a virtual machine. Those files are used by the ...

File name extensions are how OS X recognizes file types, and changing the extension is one way to associate a file with a different program. Sometimes, however, changing the file extension does not ...

In the Mac OS it is possible to change the default program the operating system will use to open a file when you double-click on it. After you have changed this file association, though, you may want ...