MS doesn't guarante that structure of the system tables wouldn't change in the future.

>there were few entries which are not table or atleast not created by me
>like
>
>MSpub_identity_range
>
>
>there was other command that I used previously
>
>select name from sysobjects where xtype = 'U' and status > 0 order by name
>
>was there any error in this
>
>Rajesh
>
>>>how to get list of user defined table from the database
>>
>>You can uses information schema which conforms to SQL-92 Standard.
>>

>>SELECT * From INFORMATION_SCHEMA.TABLES
>>	WHERE table_type = 'BASE TABLE'
>>		AND table_name <> 'dtproperties'
>>