Installation Instructions Rename the doaux.exe, dosrvc.exe and dosrvrip.exe files in /perle/dialout Copy the new doaux.exe, dosrvc.exe and dosrvrip.exe files to above directory. Rename the doip.sys file in the following directory: Windows 2000 = \System32\Drivers Windows XP = \System32\Drivers Copy the new doip.sys file to the above directory. Reboot the Windows host.