repro for vs2013 bug involving bitness-specific COM servers in C#
Choose Debug-x86 build Choose Debug-x64 build
get error 1>C:\Program Files (x86)\MSBuild\12.0\bin\Microsoft.Common.CurrentVersion.targets(1182,5): error MSB3097: File "c:\users\snuchia\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\bin\x86\Debug\ClassLibrary1.dll" is not a valid assembly.
https://connect.microsoft.com/VisualStudio/feedback/details/1627707