Index: src/ch/UpdateHeaders.cpp
===================================================================
diff -u -N -r1f27a2022090cf7aaf827a3f1ad90d6fe0038518 -r50007f112b77cba170e6c427fee5428bda2d9dc5
--- src/ch/UpdateHeaders.cpp	(.../UpdateHeaders.cpp)	(revision 1f27a2022090cf7aaf827a3f1ad90d6fe0038518)
+++ src/ch/UpdateHeaders.cpp	(.../UpdateHeaders.cpp)	(revision 50007f112b77cba170e6c427fee5428bda2d9dc5)
@@ -36,7 +36,8 @@
 		boost::lexical_cast<std::wstring>(PRODUCT_VERSION3) + L"." +
 		boost::lexical_cast<std::wstring>(PRODUCT_VERSION4) + L")";
 
-	wstrUserAgent += L" (" + m_tWindowsVersion.GetWindowsVersion() + L")";
+	wstrUserAgent += L"; " + m_tWindowsVersion.GetWindowsVersion();
+	wstrUserAgent += L"; " + m_tWindowsVersion.GetCpuArch();
 
 	return wstrUserAgent;
 }