function GetOpenFileName(const Prompt: String; var FileName: String; const InitialDirectory, Filter, DefaultExtension: String): Boolean;
Displays a dialog box that enables the user to select an existing file. Returns True if the user selected a file, False otherwise. The name of the selected file is returned in the FileName string.
An example Filter: 'Text files (*.txt)|*.txt|All files (*.*)|*.*'
var FileName: String; begin // Set the initial filename FileName := ''; if GetOpenFileName('', FileName, '', 'Text Documents (*.txt)|*.txt|All Files|*.*', 'txt') then begin // Successful; user clicked OK // FileName contains the selected filename end; end;