Active Template Library: A set of template-based C++ classes by Microsoft that simplify the programming of Component Object Model (COM) objects.

A Microsoft Visual C++ 2005 Active Template Library (ATL) Server project contains performance counters. This project is configured to register an Internet Server API (ISAPI) DLL on a Windows Vista-based computer. However, the ISAPI DLL is not registered when you run the ATL Server application. Additionally, when you try to register the ISAPI DLL manually, you may receive an error message that resembles the following:

0×80070002 COR_E_FILENOTFOUND