What is the purpose of setting the platform target for a Visual Studio application?

Question

For any VS project it is possible to set the platform target in the build properties of that project. You can set this to Any CPU, x86, x64 or Itanium. My question is, if I set

Answer 1

If you do not specify 32 bit platform the Microsoft application compatibility toolkit cannot determine the app is 32 bit and will not allow you to create a 32 bit solution file to allow an application to run without requiring admin credentials when user account control is turned on