tlbexp.exe, asmpath, and spaces

I am trying to run tlbexp.exe from a MSBuild script, and I'm feeding it the directories of the reference paths MSBuild is aware of:

<Exec Command="&quot;$(TargetFrameworkSDKToolsDirectory)tlbexp.exe&quot; &quot;$(IntermediateOutputPath)$(TargetName)$(TargetExt)&quot; /out:&quot;$(IntermediateOutputPath)$(TargetName).tlb&quot; @(TlbExpReferencePaths->'/asmpath:%(FullPath)', ' ')" />

Which is producing the following command line:

" C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.6.1 Tools\tlbexp.exe" "obj\Debug\net45\FileAndServe.Xpress.LN.TexFile.Manager.Client.dll" /out:"obj\Debug\net45\FileAndServe.Xpress.LN.TexFile.Manager.Client.tlb" /asmpath:C:\Users\wasabi\Development\FileAndServeXpress\src\FileAndServe.Xpress.LN.Enums\bin\Debug\net45\ /asmpath:C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\ /asmpath:C:\Users\wasabi\.nuget\packages\mvp.xml\2.3.0\lib\net20\ /asmpath:C:\Users\wasabi\.nuget\packages\lextm.sharpsnmplib\7.0.0.2\lib\net40\ /asmpath:C:\Users\wasabi\.nuget\packages\smapi\1.0.0\lib\ /asmpath:C:\Users\wasabi\Development\FileAndServeXpress\src\FileAndServe.Xpress.LN.TexFile.Manager.Client\obj\Debug\net45\

Which is erroring:

Error: Type library exporter cannot load type 'LexisNexis.FileAndServe.BusinessEntity.Validation.BrokenRulesList' (error: Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified. (Exception from HRESULT: 0x80070002)).

My assumption here is the /asmpath to Program Files, etc, has a path in it, and it's not being parsed out right. But, if I surround paths with ", tlbexp complains about invalid characters in path names. It's not handling quotes:

Unhandled Exception: System.ArgumentException: Illegal characters in path.

Is anybody aware of some magic for tlbexp? I'm running out of ideas.

Doesn't work from the command line either.