A DLL file is a Dynamic Link Library file, that is used within Windows operating systems. Macintosh does not use DLL files.

On a Macintosh system, the 4DSLI file is in .bundle format and is located in the "4D Extensions" folder within the 4D.app package. To locate it, you must right-click (control-click if you have a single-button mouse) on the 4D Application and choose "Show Package Contents" then navigate to the "Contents" folder and then to the "4D Extensions" folder.