"FileNameDialog"

"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]].