Hi When i use the deployment Featured Files for 64 bit application, the DBExpress Oracle Driver will use dbxora.dll and MIDAS Library will use midas.dll. However, when i copied these 2 files together with my exe application and run on a newly installed Win 10 Pro pc, the application would not connect to the database. I have already set the Net Configuration for Oracle Client and it is able to connect to the Oracle database server. However, previously when i deployed my 32 bit application using Delphi 6, i would use dbexpora.dll and when i add this file to the newly installed Win 10 Pro pc, my application is able to connect to the database. Why is this file dbexpora.dll used? Its a 32 bit dll if i am not wrong. Is there something that i did not configure correctly?   regards chris