title: Running MSBuild fails to read SDKToolsPath
body: <p>Howdy, I'm having a bit of an issue runnning a NAnt script that used to properly build my .Net 2.0 based website, when compiling with VS2008 and it's associated tools.  I've recently upgraded all the project/solution files to VS2010, and now my build fails with the following error:</p>
  
  <blockquote>
    <p>[exec]
    C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Microsoft.Common.targets(2249,9):
    error MSB3086: Task could not find
    "sgen.exe" using the S dkToolsPath ""
    or the registry key
    "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft
    SDKs\Windows\v7.0A". Make sure the
    SdkToolsPath is set and the tool
    exists in the correct processor
    specific location under the
    SdkToolsPath and that the Microsoft
    Windows SDK is installed</p>
  </blockquote>
  
  <p>Now, I DO have prior versions (.Net 3.5) of the Windows SDK installed on the build server, and the full .Net 4.0 framework is installed, but I've not run across a .Net 4.0 specific version of the Windows SDK.</p>
  
  <p>After a bit of experimentation and research, I finally just setup a new environmental variable "SDKToolsPath" and pointed it to the copy of sgen.exe in my windows 6.0 sdk folder.  This generated the same error, but it got me to notice that even though the SDKToolsPath environmental variable IS set (confirmed that I can "echo" it at the command line and it has the expected value), the error message seems to indicated that it's not being read (note the empty quotes).  </p>
  
  <p>Most of the information I've found is .Net 3.5 (or earlier) specific.  Not much 4.0 related out there yet.  Searching for error code MSB3086 generated nothing useful either.  Any idea what this might be?</p>
  
  <p>Scott</p>