You can use Ldifde to import that list . This is a tool included on the Windows 2000 resource CD and is installed with 2000 and 2003 server. ldifde.exe is provided natively with the W2K and W2K3 OS and is located in %systemroot%\system32
This is what MS has to say about it:
The LDAP Data Interchange Format (LDIF) is a draft Internet standard for a file format that may be used for performing batch operations against directories that conform to the LDAP standards. LDIF can be used to export and import data, allowing batch operations such as add, create, and modify to be performed against the Active Directory. A utility program called LDIFDE is included in Windows 2000 to support batch operations based on the LDIF file format standard. This article is designed to help you better understand how the LDIFDE utility can be used to migrate directories.
You can find the syntax and parameters here.