In our small office all the .mdb file are shared and we work with it as necessary. And we started noticing that we unable sometimes to open multiple .mdb files, although everything was fine with it earlier. Then we began to puzzle out this problem and it has emerged that if someone opens a random .mdb file no others can open it by double click. Someone advised to us reassociate all .mdb file types with Access, unfortunately this did not work. Does anyone know a solution or some tips how could we fix it?