But here are the external tool parameters in case you want to test it out on yourself beforehand:

Location: D:\dev\engines\A8.45.1\acknex.exe
Working Directory: D:\dev\engines\A8.45.1
Arguments: ${selected_resource_loc} --diag

Then, select in the Project Explorer the file to start and run the external tool on that.

Make sure that for each project you set under Properties\C/C++ General\Paths and Symbols\Includes the path to the Gamestudio include files (D:\dev\engines\A8.45.1\include).