Activate the Office Web Apps services immediately after you run setup. When you run Wcsetup.exe, Office Web Apps setup takes control of the Default open behavior for browser enabled documents setting for all document libraries. If a user clicks on a document in a library in SharePoint Server after Office Web Apps setup has been run, but before Office Web Apps services have been activated, the user can get a broken link when opening a document in a browser. We strongly recommend that you activate the Office Web Apps services and the Office Web Apps feature immediately after you run setup or that you disable the Default open option until Office Web Apps feature and services have been activated