Start Visual Studio 2008
Click on 'create project' and select "Native" under Cobol Projects.
Select the "Empty Project" template in the right-hand window and click 'ok'
Open the project properties and click on the 'debug' tab
Select "Start External Program" and browse to the core dump file. (Note: next to the 'filename' window at the bottom, select to view 'All files' in order to be able to select a corefile (i.e. a non-executable file))
click on 'Open'
Select 'Debug' -> Start Debugging

If there is a popup error window regarding build errors, select 'yes' (to continue with the last successful build)

The debugger positions itself on the line of code that caused the coredump