Epson AcuLaser C4000 Reference Manual page 374

2. Select the characters, then select Font from the Format menu.
3. Select the EPSON BarCode Font you want to use, then set the
font size and click OK.
Note:
In Windows XP, 2000 and NT 4.0, you cannot use font sizes larger
than 96 points when printing ba rcodes.
362 Working with Fonts