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You may recieve the following error when building .NET 3.5 or lower projects on .NET 4.0 Msbuild or team build where references requires SGEN:
SGEN: Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.
In order to used mixed mode assemblies in 4.0, it must be configured in configuration file for Sgen
Add the infomation below to the sgen.exe.config file located at the following location: ..\Program Files\Microsoft SDKs\Windows\v7.0A\bin\NETFX 4.0 Tools\
<?xml version ="1.0"?>
<supportedRuntime version="v4.0" />
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.
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