File Installation Overview
Consider, as an example, the problem posed by the existence of multiple versions of the common dialog library COMMDLG.DLL. This library provides common dialog boxes for applications. Imagine that a computer user has installed a new application package that uses the latest version of this library. Everything is working well. The user then purchases a copy of your application that the local software store has had on its shelf for several months. Your application also uses the COMMDLG.DLL library but, because it was packaged some months ago, it includes a rather old copy of this library. If your installation program simply copies the COMMDLG.DLL library to the user's system, your application will work fine, but the original ...
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