Does anyone knows why i can call an ACCESS 97 APP from vb and i can not do it from ACCESS 2000?

From VB6 (and with the appropiate refrences installed) i used to call and ACCESS APP, now in ACCESS 2000, the VB program just display de ID FORM. This means: The APP has a main menu, this main menu call and ID FORM in order to control de access, but now only de ID FORM is displayed.

P.D.: THE ACCESS APPP is a MDE.