A DLL file often has file extension .dll, but can have any file extension. Developers can choose to use a file extension that describes the content of the file such as .ocx for ActiveX controls and .drv for a legacy device driver.
A DLL file often has file extension .dll, but can have any file extension. Developers can choose to use a file extension that describes the content of the file such as .ocx for ActiveX controls and .drv for a legacy device driver.