/ImportLDIFFiles:"filename.ldf" Optional. Specifies which optional ldif files you want to import into the AD LDS instance ...

/ImportLDIFFiles:"filename.ldf"
Optional. Specifies which optional ldif files you want to import into the AD LDS instance schema, among: md-User.ldf, ms-InetOrgPerson.ldf, ms-UserProxy.ldf, and ms-adman.ldf. By default, none of these optional ldif files are imported.