Brother GTX-4 Instruction Manual page 100

(3) From [Printer], select "Brother GTX-4 FileOutput" for file output.
<TIPS>
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If [Printer] is set to "Brother GTX-4", the print data will be sent to the printer.
If [Printer] is set to "Brother GTX-4 FileOutput", the print data will be saved as an ARX4 file.
(4) On the [Advanced], make your settings for the printer driver.
<TIPS>

For setting details, refer to "5-5. Printer driver's setting from other applications >>P.105".
(5) When you press [Print], the dialog box shown below will be displayed on the screen. After that, click [Save].
<TIPS>

There may be cases where this saving process takes several minutes.
(6) Specify the [Save In] and [File name] first, then click [Save] to save the ARX4 file to your PC.
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Creating print data