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 bug in Lion means Apple's popular TextEdit utility may append the TXT extension to files regardless of their original file types. Topher, an avid Mac user for the past 15 years, has been a ...

Small File Explorer changes that remove daily Windows friction.

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 ...