samba - Dec 2005 - Problem with crpyt password under XP

hi,

i installed  samba with openldap support and all works fine ...

I used scripts called smbldap_passwd (from idealx) to change the password of
users on the linux server.

I modified the parameter of the file smbldap.conf "hash_encrypt" to 
PLAINTEXT (I know it's dangerous but it's just for test).

When i change the user's password with the command smblda_password , the
encrpytion's format  is good for the 3 following passwords :
sambalmpassword,sambantpassword and userPassword.So the userPassword 's 
format
is PLAINTEXT. All is good.

But when a user change his password under windows XP or 2000 (ctrl-alt-sup +
change password), it's ok but the userpassword 's format has changed
.The format
is SMD5 and not plaintext.

what configuration'file i have to change to keep format plaintext when a
user
change his password under windows xp/2000?

Thanks for your help