The bootloader file
The default bootloader for Windows XP is a file named "ntldr". This file is in the root of the drive to be booted from (i.e. usually "c:\ntldr").

The ntldr file's properties as on my laptop.

As it is a hidden file, you may need to adjust Explorer's view settings to be able to view hidden files ("Tools > Folder Options", "View" tab).

Modifying the file involves editing it with a hex editor (I used the freeware XVI32). Throughout this guide, when referring to bytes by their hexadecimal value, I will put "h" in front of the value for clarity. For example, hFF = decimal value 255, and h48 = decimal value 72.

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- Robbi-985 aka SomethingUnreal