Add Existing Item Command
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Adds an existing file to the current solution and opens it.
File.AddExistingItem filename [/e:editorname]
Required. The full path and file name, with extension, of the item to add to the current solution. If the file path or file name contains spaces, enclose the entire path in quotation marks.
Optional. Name of the editor in which the file will be opened. If the argument is specified but no editor name is supplied, the Open With dialog box appears.
editorname argument syntax uses the editor names as they appear in the Open With Dialog Box, enclosed in quotation marks. For example, to open a style sheet in the source code editor, you would enter the following for the /e:
/e:"Source Code (text) Editor"
Autocompletion tries to locate the correct path and file name as you type.
This example adds the file, Form1.frm, to the current solution.
>File.AddExistingItem "C:\public\solution files\Form1.frm"