Asp.net server migration from 2003 to 2008 configuration fil

I have a windows application program, exe for this application is executed remotely by some other system. Now there are server upgrade activity carried out and application is moved to new server 2008 from 2003

There is no change in configuration section made by me.

Here is how the config file looks like

Now the issue is, post migration from 2003 ( 32 bit ) to 2008 ( 64 bit ) the windows application could not read the custom configuration defined at configSections section.

Not able to find settings required post migration which will enable the program to read config sections settings.

Any help will be appreciated !