>I have made a program that use DAO,
>in the first time my program was using a .mdb(97) file now I'm tring to connect the same db in the .mdb(2000) format with the same project and it's not working...
>
>an error occur and say database format unknown....
>I can't figure how to repair this thing..
>
>can someone help, please...

You need to reference DAO 3.6 (instead of DAO 3.51).