Downloaded patch files will not run or it opens in another application

The problem occurs when another application is allowed to insert itself as the default handler application for files with a certain extension. If an application is allowed to take over the extension “.msp” any patch file downloaded from MatchWare cannot be installed by double clicking it.To fix the problem, configure the application that opens the “.msp” files to no longer accept this extension – which should allow the Microsoft Installed utility to regain control.