I have TWO compilers for CB, the default compiler is MinGW(gcc), and another is MSVC.
Now, When I create new MSVC8 projects, and debug CB, when step to this code:
void NativeParser::AddCompilerDirs(cbProject* project)
In the project directory will create a project file, which reads:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<CodeBlocks_project_file>
 <FileVersion major="1" minor="6" />
 <Project>
  <Option title="" />
  <Option pch_mode="2" />
  <Option compiler="gcc" />
  <Build />
  <Extensions>
   <code_completion />
   <debugger />
  </Extensions>
 </Project>
</CodeBlocks_project_file>
We can see this line: 
  <Option compiler="gcc" />It's must be msvc8, but NOT gcc!So, I make a patch to fix this BUG.
Like this:
CompileTargetBase* Wiz::RunProjectWizard(wxString* pFilename)
{
...
    // now create the project
+    wxString defCompilerID = CompilerFactory::GetDefaultCompilerID();
+    CompilerFactory::SetDefaultCompiler(GetCompilerID());
    theproject = Manager::Get()->GetProjectManager()->NewProject(prjname);
+    CompilerFactory::SetDefaultCompiler(defCompilerID);
    if (!theproject)
    {
        cbMessageBox(_("Couldn't create the new project:\n") + prjdir, _("Error"), wxICON_ERROR);
        Clear();
        return 0;
    }
 
  This patch only add three statements.
Now, it's work well.
Patch in here:
Index: src/plugins/scriptedwizard/wiz.cpp
===================================================================
--- src/plugins/scriptedwizard/wiz.cpp	(revision 6195)
+++ src/plugins/scriptedwizard/wiz.cpp	(working copy)
@@ -346,7 +346,10 @@
     }
 
     // now create the project
+    wxString defCompilerID = CompilerFactory::GetDefaultCompilerID();
+    CompilerFactory::SetDefaultCompiler(GetCompilerID());
     theproject = Manager::Get()->GetProjectManager()->NewProject(prjname);
+    CompilerFactory::SetDefaultCompiler(defCompilerID);
     if (!theproject)
     {
         cbMessageBox(_("Couldn't create the new project:\n") + prjdir, _("Error"), wxICON_ERROR);
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