In most cases you can't with MS Access! But here is the sweet part. You can still access querys, tables, some system objects and procedures as well as functions with another ODBC SQL tool. I ues Query Tool ODBC. The file names is QTODBC.EXE and can be downloaded from any ftp site or www.download.com.
What I did when MS Access would not open my db is copied each table using QTODBC into Excel, I did the same thing fro each query. THE BEST THING ABOUT THIS IS YOU CAN RECOVER YOUR NATIVE APPLICATION'S SQL LANGUAGE!!!!!!!!!. Simply copy and past it into Excel and then back into access! Yes, you do loose macro logic but this beats the heck out of restarting from scratch!