Brother GTX600NB Instruction Manual page 97

(3) From [Printer], select "Brother GTX-6 FileOutput" for file output.
<TIPS>

If [Printer] is set to "Brother GTX-6", the print data will be sent to the printer.
If [Printer] is set to "Brother GTX-6 FileOutput", the print data will be saved as an ARX6 file.
(4) On the [Advanced], make your settings for the printer driver.

In the case of print data using white ink ☞"4-4-1. Setting up the printer driver >>P.4-22"

In the case of print data using color ink and black ink only ☞"4-5-1. Setting up the printer driver >>P.4-39"
<CAUTION>

For Adobe Illustrator, set the platen size for the paper size in the Print dialog box in the application.
The size or placement of the image may not be set correctly if you make settings in the Print Settings dialog.
(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, and then click [Save] to save the ARX6 file to your PC.
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Creating print data