Linux typically doesn't rely on file extensions; it gets a files type using "magic numbers" within the file itself. Linux apps, including GNOME Files, may still use extensions to determine file type.

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 ...