diff -r 00912625b7c5 code/ryzom/client/src/login.cpp
--- a/code/ryzom/client/src/login.cpp	Thu Mar 08 16:59:03 2012 +0100
+++ b/code/ryzom/client/src/login.cpp	Fri Mar 09 12:50:46 2012 +0100
@@ -1789,16 +1789,17 @@ class CAHOpenURL : public IActionHandler
 		installTag = CSystemUtils::getRegKey(KeyName);
 
 		if (installTag.length() > 1)
 		{
 			nldebug("Found install tag '%s'", url.c_str());
 		}
 		else
 		{
+			DWORD ret = 0;
 			LPVOID lpMsgBuf;
 			FormatMessage(
 				FORMAT_MESSAGE_ALLOCATE_BUFFER |
 				FORMAT_MESSAGE_FROM_SYSTEM |
 				FORMAT_MESSAGE_IGNORE_INSERTS,
 				NULL,
 				ret,
 				MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language