Well if you've followed the bypass technique:
http://office.microsoft.com/en-us/access/HA102269961033.aspx and it still won't open it sounds as though the developer has set the allowbypass property to false presumably for a good reason
However you can reset the allowbypass property externally by using DAO this links shows an example
http://www.dbforums.com/showthread.php?t=780243
