diff -r adbc41dc9cd0 -r 979f2ccfee5a core/smn_core.cpp
--- a/core/smn_core.cpp	Mon Oct 15 04:06:57 2007 +0000
+++ b/core/smn_core.cpp	Mon Oct 15 04:27:56 2007 +0000
@@ -463,7 +463,17 @@
 	char *str;
 	pContext->LocalToString(params[1], &str);
 
-	return g_PluginSys.LibraryExists(str) ? 1 : 0;
+	if (g_PluginSys.LibraryExists(str))
+	{
+		return 1;
+	}
+
+	if (g_Extensions.LibraryExists(str))
+	{
+		return 1;
+	}
+
+	return 0;
 }
 
 static cell_t sm_LogAction(IPluginContext *pContext, const cell_t *params)