On computers and mobile devices, file extensions are the suffixes that apps append to filenames. When you see an item like "document.docx" for example, the .docx extension tells the computer and the ...

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 ...

Last week I covered some basic file management tips in “Windows Explorer Explained: Tips for Newbies“–and the article was so popular that I figured I should just keep going. So this week I’ll stick ...

Dylan Turck is a PC hardware, software, and gaming reporter who loves writing how-to guides and in-depth features on the latest tech products. When he's not shocking himself by pulling electronics ...

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?