This is from the SAP install manual. However we were not able to find any file like this in our installation disks.
“You use this procedure to install the R3SETUP tool on the domain controller where the Active
Directory is located.
…
1. Log on to the domain controller as domain administrator.
2. Check that the TEMP environment variable has been set:
a. Right-click My Computer on the Windows desktop
b. Choose Properties → Advanced → Environment Variables.
TEMP is normally set to:
%userprofile%\Local Settings\Temp
For more information, see SAP Note 387745.
3. Insert the SAP Kernel CD.
4. Start the program R3SETUP.BAT from the directory
<CD_DRIVE>:\NT\COMMON
The R3SETUP window opens.
5. Enter the following when R3SETUP prompts you:
The name of your SAP system <SAPSID>
The directory on your hard disk that the R3SETUP files are to be copied to. The
default directory is <DRIVE>:\USERS\<SAPSID>ADM\INSTALL
When you have made all the required entries, the R3SETUP tool is automatically
installed.
6. Choose Yes when a dialog box appears prompting you to log off or reboot.
The R3SETUP tool now automatically logs off or reboots.” – SAP Installation Manual