I have a custom project file type for a language I'm integrating with VS
using the MPF. When I build a project based from this template within the IDE
I always get an error dialog "Value does not fall within expected range"
after the build completes successfully. If I run MSBuild on the same project
via the command line there are no problems. Ideas? I've pasted my project
template xml below.

<Project DefaultTargets="Build"
xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 <PropertyGroup>
   <Configuration Condition=" '$(Configuration)' == ''
">xxxExt</Configuration>
   <Name>"Application"</Name>
   <ProductVersion>8.0.50727</ProductVersion>
   <xxxRuntimes>Set to the full path of your xxx exe</xxxRuntimes>
   <xxx_PATH>.;</xxx_PATH>
   <EntryScript>.\entry.xxx</EntryScript>
 </PropertyGroup>
 <PropertyGroup Condition=" '$(Configuration)' == 'xxxExt' ">
 </PropertyGroup>
 <ItemGroup>
   <Compile Include="entry.xxx">
     <SubType>Code</SubType>
   </Compile>
 </ItemGroup>
 <Target Name="Build">
   <Exec Command=""$(xxxRuntimes)" "$(EntryScript)"" IgnoreExitCode="false"/>
 </Target>
 <Target Name="Compile"/>
</Project>