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To avoid messing with system registry settings it sounds like WerRegisterRuntimeExceptionModule could also work, at least on Windows7 http://msdn.microsoft.com/en-us/library/windows/desktop1/dd408167%28v=VS.85%29.aspx
There could be a dll which would do nothing when receiving the crash report for expected crashes (test_capi and test_faulthandler). WerRegisterRuntimeExceptionModule doesn't exist in the headers of the SDK that comes with VS2008 but it could be retrieved at runtime with GetProcAddress. It's more work than the registry setting but seems cleaner since it avoids changing system settings.