A client or Web application assembly or group of assemblies is bound to a version of shared assemblies associated with a particular targeted execution environment. The targeted execution environment (and thus the version of shared assemblies associated with it) may be selected or detected. A file such as a configuration file is automatically modified. The selected or detected execution environment may be the same as or different than the local version. The client or Web assembly is automatically bound to the targeted shared assemblies. A user interface enables the selection of a particular execution environment. Alternatively, a user interface informs of the detected targeted execution environment and enables the reconfiguration of the Web assembly. This invention provides a mechanism and process for maintaining legacy software after a new software development tool is installed, without deploying a new version of shared assemblies.