After installing Microsoft Office, there is an Office Authorization plug-in for NPAPI browsers in about:plugins page in Chrome. Is this supposed to open Office documents directly in the browser? But every time I click an .doc or .ppt file, Chrome still prompts an download dialog instead of using this plugin. How to config it then?
It isn’t a plugin to view Office documents in a browser, at least not directly. Rather, it is a plugin to provide support for Office Web Apps which is basically Microsoft’s version of Google Docs. If you use Office Web Apps, then you will need to keep the plugin enabled, otherwise you can disable it.