DocumentationMathematicaFront EndFront End TokensInput Menu
"FileNameDialog" is a front end token that opens a dialog box to retrieve the full pathname of a file.
This token is equivalent to the menu command Input Get File Path.
When a file is selected, clicking Open pastes the full pathname of the file into the notebook at the current selection.
To execute a front end token, you typically evaluate a command of the form FrontEndExecute[FrontEndToken[token]].