System Files (55 file types)
System Files - Types & Formats of file extensions
Mac, Windows, and Linux operating systems all have system files such as dynamic link libraries. Other examples of system files comprise icons, themes (a combination of background pictures, colors, and sounds), and device drivers (a computer program that controls a device attached to the computer).
File outputs by the system are also added to this category. Popular system file extensions are .DLL, .CPL, .SYS, and .DRV.