DLL Help

This database contains information about DLL files that are included with selected Microsoft products.DLL Help exists to help developers, system administrators, and other IT professionals who face file version conflicts with Microsoft software. Use DLL Help to identify the software that installed a specific version of a DLL file.Note This tool does not provide direct links to download the files listed in the database. DLL files are generally not available for download from Microsoft.

http://support.microsoft.com/dllhelp/