Add Existing Item Command
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
Adds an existing file to the current solution and opens it.
Syntax
File.AddExistingItem filename [/e:editorname]
Arguments
filename
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.
Switches
/e: editorname
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.
The /e: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:editorname argument.
/e:"Source Code (text) Editor"
Remarks
Autocompletion tries to locate the correct path and file name as you type.
Example
This example adds the file, Form1.frm, to the current solution.
>File.AddExistingItem "C:\public\solution files\Form1.frm"