How To Resize the Welcome/Logon Screen Picture

Does anyone know how I can change the size (make it larger) of the picture/icon at the welcome/logon screen? I’m talking about the picture associated with the user account. I know the default is 48x48 but would like to resize it to maybe 64x64 or maybe even 128x128. By the way I am using Windows XP Pro.

AFAIK XP Pro is limited to a 48x48 bitmap for logon pictures; the only way to change this would be to hack the code for the logon screen, which would be both difficult and highly unrecommended.

Vista gives a larger image (if you have a password set for that account) as does Win7.