NUnit does not run on Vista x64 in Visual Studio 2003

Question

I am trying to run NUnit in Visual Studio 2003 on 64-bit Vista but with no success.

I have set the Debug Mode of the Project to "Program" and the Start Application to "C:\Program Files (x86)\NUnit 2.4.8\bin\nunit.exe". The Test Project is set as the StartUp Project. All the code is in .NET 1.1. Unlike .NET 2.0 the processor architecture cannot be targeted (when a 1.1 executable is loaded on an x64 machine it is run in the WoW64 as a 32-bit process and utilises the 32-bit framework).

After I hit Debug > Start I receive the error window "A project with an Output Type of Class Library cannot be started directly". I am stuck and cannot get NUnit to run.

The nearest related question on stackoverflow dealt with getting NUnit to run on Vista x64 in Visual Studio 2005 "Nunit.exe cannot work on Vista 64bits if x86 build (stackoverflow.com/questions/208985/nunit-exe-cannot-work-on-vista-64bits-if-x86-build). Additionally NUnit did not install a nunit-x86.exe from the NUnit-2.4.8-net-1.1.msi image.

My Development Environment
Vista x64 with SP1
Visual Studio 2003 (version 7.1.3088)
.NET Framework 1.1 (version 1.1.4322 SP1)
NUint 2.4.8 (installed from NUnit-2.4.8-net-1.1.msi)

Answer 1

I found the issue - and it had nothing to do with Vista x64.

I had set the Debug Mode of the main Project to "Program" and the Start Application to "C:\Program Files (x86)\NUnit 2.4.8\bin\nunit.exe" and not the Test Project.

Even though I had set the Test Project to the StartUp Project the Debug Mode in the Test Project was still set to the default "Project" and not to the "Application". I switched the debugging configurations around; so the main Project was set to "Project" and the Test Project contained the NUnit debugging configurations.

Summary: NUnit does run on Vista x64 in Visual Studio 2003.