File Types Editor
Specifies file associations on a target computer and to specify the verbs that identify the actions allowed for each file type.
To access the File Types Editor, on the View menu, point to Editor, and then click File Types when a deployment project is selected in Solution Explorer.
The File Types Editor contains a single pane with hierarchical list of file types and actions. By default, the File Types Editor contains a single File Types on Target Machine node; new file types may be added beneath that node.