The main LINGO DLL requires many additional component DLLs. All the required DLLs are installed as part of the normal LINGO installation in the main LINGO folder. If you need a specific list of all the supporting DLLs required by the LINGO DLL, then you can open Lingd17.Dll in the Dependency Walker utility available at no charge from the following website: http://www.dependencywalker.com. The Dependency Walker program is a useful tool that lists all the required DLLs for an application, their current location on your system, and flags any DLLs that are not currently available.