>After delete the hotelwin.DCX file the msg is:
>No drilldown information is available for the hotelwin database. The database may be invalid.
>
>and i press Validate button and the msg is:
>Memo file c:\hotelwin\data\hotelwin.DCT is missing or is invalid.

Is the .DCT file still there, or did you accidentally delete it with the DCX? If it's there, try

USE hotelwin.dbc

and if it opens, BROWSE it. I expect that you'll get the same message as when you tried to Validate, but it will be good to verify.