MS KB Article ID: Q238149
To add a carriage return to the Legal Notice text of a logon dialog box, follow these steps:
Start Registry Editor (Regedt32.exe).
Locate the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Locate and double-click the LegalNoticeText value.
Type the text that you want displayed in the Legal Notice message, and then click OK.
On the Edit menu, click Binary. This opens the text of the message in the binary editor. Each letter of the message (including spaces) is represented in hexadecimal, with four characters in the binary editor representing one letter of text in the message.
To insert a carriage return after a line of text, click the space just after the last character in the message where you want to put the first carriage return, type 0D00, and then click OK.
Remember that one letter of normal text is equal to four characters in the binary editor. Count the number of characters before the next location where you want to put a carriage return, and multiply this by four. Move over this number of spaces in binary mode, and then type 0D00 again.
Repeat this process for each carriage return that is needed. You can put two carriage returns next to each other to simulate a new paragraph
regards,
Leopold