Issue in deleting folders and files using msbuild - asp.net-mvc-2

Question

I am trying to delete some files and folders excluding few files using msbuild.
<PropertyGroup>
<SolutionName>TestProject</SolutionName>
<SolutionFileName>$(MSBuildProjectDirectory)/$(SolutionName).sln</SolutionFileName>
<Configuration Condition=" '$(Configuration)' == '' ">Release</Configuration>
<BuildVersion Condition="'$(BuildVersion)' == ''">1.0.0.0</BuildVersion> <BuildTargetFolder>$(MSBuildProjectDirectory)\..\..\TestProjectBuild</BuildTargetFolder>
<OutputPath>$(BuildTargetFolder)\Builds\$(Configuration)\TestProject - $(BuildVersion)</OutputPath>
</PropertyGroup>
<Target Name="CleanDirExludeFinalOutput">
<ItemGroup>
<!-- Item to get all files recursively in the DeleteRoot folder -->
<FilesToDelete Include="$(OutputPath)\**\*.*" Exclude="$(OutputPath)\**\*.msi;$(OutputPath)\**\*.exe"/>
<!-- Item to get all folders from the files to be deleted -->
<FoldersToDelete Include="%(FilesToDelete.RootDir)%(FilesToDelete.Directory)" Exclude="$(OutputPath)"/>
</ItemGroup>
<!-- Display what will be deleted -->
<Message Text=" # #(FilesToDelete)" Importance="high" />
<Message Text=" # #(FoldersToDelete)" Importance="high" />
<!-- Delete the files -->
<Delete Files="#(FilesToDelete)" Condition=" $(OutputPath)!=''" ContinueOnError="true"/>
<!-- Remove the folders -->
<RemoveDir Directories="#(FoldersToDelete)" Condition="$(OutputPath)!=''" />
</Target>
Now when I am trying to run the above script using msbuild command from the VisualStudio2010 CommandPrompt I see all the files are deleted. I don't want to delete the TestProject.msi,setup.exe.
The above works fine if I set
<BuildTargetFolder>C:\temp\TestProjectBuild</BuildTargetFolder>
All the files and folders are deleted with the exception of TestProject.msi,setup.exe
Can anyone help me to resolve this issue?