Build customization "{0}" uses file extension "{1}". This file extension is currently mapped to {2} "{3}" in one or more ...

      Build customization "{0}" uses file extension "{1}".  This file extension is currently mapped to {2} "{3}" in one or more project configurations.

      If the build customization file is associated with this project, files with this extension (that do not have file-level properties set) may use this build customization instead.  Do you still want to associate build customization file "{4}" with this project?