What you are describing is not possible. It involves the transfer of the MDB file between server and client, and then execution of the MDB file so that it opens up. The thing is, it's not allowed.

You CAN initiate the download of the MDB file between server and client. You cannot get the MDB file to open up itself though. It is something that has to be done manually by the user, provided the user has accepted the download when the download dialog box came up.