I have an application that has drag and drop functionality to import images and video\'s. While developing, and testing through Visual Studio this has never given any problems.<
Build a debug version of your application, build your installer with the output. You can either include the .pdb files in the installer or copy them to the install location after you install.
Run the installed application, and then in Visual Studio, go to Debug --> Attach to Process. Select the process from the list, and click the "Attach" button. Add breakpoints, etc, and debug as normal.
If you don't run into the problem on your build machine, you can also run a remote debugging session to debug the application on a different computer, but this requires a little more setup.