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 ...

WSJ Buy Side is The Wall Street Journal’s research and commerce team. Our commerce content is distinct from our newsroom coverage. We earn a commission from some links in our articles. Learn more. Oct ...

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 ...

Microsoft hides file extensions in Windows by default even though it's a security risk that is commonly abused by phishing emails and malware distributors to trick people into opening malicious files.

One of the easiest ways to render your computer unusable is to mess with the operating system’s files and settings–one accidental deletion of a single file can ...

Recently I’ve been downloading some audiobooks in MP3 format. I wanted to import them into iTunes for listening on the go, but there’s one problem: iTunes (and, more importantly, my iPhone) can’t ...

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 ...

Safari extensions, first introduced with version 5 of Apple’s Web browser, allow developers to create all sorts of clever add-ons to augment and enhance the surfing experience. If you know a little ...

Tired of digging through dialog boxes to show file extensions and hidden files? Try adding those options from the ribbon to the Quick Access Toolbar so they're always visible. File extensions are a ...