Como implementar um cliente de e-mail padrão por usuário no Windows XP?

Editor de registro do Windows versão 5.00

[HKEY_CURRENT_USER \ SOFTWARE \ Classes \ mailto]
"Protocolo de URL" = ""
"EditFlags" = hex: 02,00,00,00
@ = "URL: Protocolo MailTo"

[HKEY_CURRENT_USER \ SOFTWARE \ Classes \ mailto \ DefaultIcon]
@ = hex (2): 25,00,50,00,72,00,6f, 00,67,00,72,00,61,00,6d, 00,46,00,69,00,6c, 00, 65, \
00,73,00,25,00,5c, 00,4f, 00,75,00,74,00,6c, 00,6f, 00,6f, 00,6b, 00,20,00,45,00, \
78,00,70,00,72,00,65,00,73,00,73,00,5c, 00,6d, 00,73,00,69,00,6d, 00,6e, 00,2e, \
00,65,00,78,00,65,00,2c, 00,2d, 00,32,00,00,00

[HKEY_CURRENT_USER \ SOFTWARE \ Classes \ mailto \ shell]

[HKEY_CURRENT_USER \ SOFTWARE \ Classes \ mailto \ shell \ open]

[HKEY_CURRENT_USER \ SOFTWARE \ Classes \ mailto \ shell \ open \ command]
@ = hex (2): 22,00,25,00,50,00,72,00,6f, 00,67,00,72,00,61,00,6d, 00,46,00,69,00, 6c, \
00,65,00,73,00,25,00,5c, 00,4f, 00,75,00,74,00,6c, 00,6f, 00,6f, 00,6b, 00,20,00, \
45,00,78,00,70,00,72,00,65,00,73,00,73,00,5c, 00,6d, 00,73,00,69,00,6d, 00,6e, \
00,2e, 00,65,00,78,00,65,00,22,00,20,00,2f, 00,6d, 00,61,00,69,00,6c, 00,75,00, \
72,00,6c, 00,3a, 00,25,00,31,00,00,00

Editor de registro do Windows versão 5.00

[HKEY_CURRENT_USER \ SOFTWARE \ CLASSES \ mailto]
"Protocolo de URL" = ""
"EditFlags" = hex: 02,00,00,00
@ = "URL: Protocolo MailTo"

[HKEY_CURRENT_USER \ SOFTWARE \ CLASSES \ mailto \ DefaultIcon]
@ = hex (2): 25,00,50,00,72,00,6f, 00,67,00,72,00,61,00,6d, 00,46,00,69,00,6c, 00, 65, \
00,73,00,25,00,5c, 00,49,00,4e, 00,54,00,45,00,52,00,4e, 00,7e, 00,31,00,5c, 00, \
48,00,4d, 00,4d, 00,41,00,50,00,49,00,2e, 00,44,00,4c, 00,4c, 00,2c, 00,31,00,00, \
00

[HKEY_CURRENT_USER \ SOFTWARE \ CLASSES \ mailto \ shell]

[HKEY_CURRENT_USER \ SOFTWARE \ CLASSES \ mailto \ shell \ open]

[HKEY_CURRENT_USER \ SOFTWARE \ CLASSES \ mailto \ shell \ open \ command]
@ = hex (2): 72,00,75,00,6e, 00,64,00,6c, 00,6c, 00,33,00,32,00,2e, 00,65,00,78,00, 65, \
00,20,00,22,00,25,00,50,00,72,00,6f, 00,67,00,72,00,61,00,6d, 00,46,00,69,00, \
6c, 00,65,00,73,00,25,00,5c, 00,49,00,4e, 00,54,00,45,00,52,00,4e, 00,7e, 00,31, \
00,5c, 00,48,00,4d, 00,4d, 00,41,00,50,00,49,00,2e, 00,44,00,4c, 00,4c, 00,22,00, \
2c, 00,4d, 00,61,00,69,00,6c, 00,54,00,6f, 00,50,00,72,00,6f, 00,74,00,6f, 00,63, \
00,6f, 00,6c, 00,48,00,61,00,6e, 00,64,00,6c, 00,65,00,72,00,20,00,25,00,31,00, \
00,00