Optional. Specifies the type of file to be created. If no template name is given, a text file is created by default.
The /t:templatename argument syntax mirrors the information found in the Add New Solution Item dialog box. You must enter the complete category followed by the file type, separating the category name from the file type by a backslash (\) and enclosing the entire string in quotation marks.
For example, to create a new text file, you would enter the following for the /t:templatename argument.