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 teach a lot of computers users who are new to the Mac experience, or who have only ever known Windows. And because virtually every Windows program names files with extension names already, they have ...

While the launch services in OS X use file name extensions to associate files with various applications, generally users do not need to interact with these extensions and the system keeps them hidden ...

We have commented on the "file name extension" controversy before. We recently tripped over one of its negative effects. It specifically applies to what is covered in the following section of the ...

1How to view file name extensions for all files on a Mac 2How to view file name extensions for a individual file on a Mac The default setting for Mac OS is to not display a file's extension. For those ...