Thanks for all the reply. I made a small project only to open the mdb file, but it didn't work. My mdb file contains a few dbf files, so my old Delphi program started opening the mdb file and depending what option I opened, it opened one of the dbf chosen file. Maybe a driver is missing? Checked MS website, there I found a AccessDatabaseEngine, one for 64 bits and one for 32 bits. My Windows is 64 bits, was created with Access from Office 2000 (32 bits). I installed the 32 bits of this driver, but still not able to opens mdb file.