A DLL (Dynamic Link Library) is a file containing code and data that multiple programs can use simultaneously. When WinOLS launches, it calls upon various DLL files to perform specific tasks (like handling the interface, calculating checksums, or communicating with hardware).
When the application launches, it calls upon these libraries. If the call fails—due to a missing file, a permission block, or a path error—the software triggers a generic "Error Load DLL" exception, preventing startup. winols 2.24 error load dll