Thanks for the links and information mmebane.

Here are the instructions to install the compiler (AMD64 version) / debugger:
- Install the SDK and the debugger package
- Open Code::Blocks and go to Settings - Compiler and debugger. Select the Programs tab
- Insert the SDK installation directory to the "Compiler's installation directory" text box.
- Select the Additional paths tab. Add <SDK-Installation-Directory>\Bin\win64\x86\AMD64. Replace the <SDK-Installation-Directory> with the real one.
- Add the debugger installation directory to the additional paths
- Go to the Directories tab and select the Compiler tab.
- Add <SDK-Installation-Directory>\Include, \Include\atl, \Include\crt, \Include\crt\sys, \Include\mfc.
- Go to the Linker tab.
- Add <SDK-Installation-Directory>\Lib\AMD64, \Lib\AMD64\atlmfc
- Go to the main Linker tab.
- In the link libraries, click Add, type "bufferoverflowU.lib" and click OK.
Click OK to save all modifications you've made.
Go to File - New. Select Win32 GUI Project. Be sure to the select the Visual C++ 2005 compiler in the wizard.
Click F9 to Build and run the project. You can verify that the application is indeed native 64-bit app by looking the application's image name from Task Manager. Applications that are native don't have the "* 32" in their name.
Let's test the debugger next. Close the test app you builded. Add a few breakpoints to the source and press F8. Verify that the application execution stops at the breakpoints.
Now you should have a 64-bit debugging / building environment in Code::Blocks.
Arto