All file I/O commands are initially inserted into the measurement routine by selecting the appropriate file I/O menu option (select Insert | File I/O Command from the menu). Once a command exists in the Edit window, you can then press F9 on the command to access its associated File I/O dialog box.
A sample File I/O dialog box
This dialog box provides a visual way to edit the current file I/O command. Alternately, you can modify a command inside the Edit window by using the techniques discussed in the "Using the Edit Window" chapter.
You should not use this dialog box to insert new file I/O commands. That must be done by selecting the appropriate menu option or by typing the commands directly into the Edit window.