--- misc/libxml2-2.9.4/uri.c	2015-11-02 23:28:09.000000000 -0800
+++ misc/build/libxml2-2.9.4/uri.c	2016-03-26 10:19:45.838472000 -0700
@@ -2412,6 +2412,15 @@
 	return xmlStrdup((const xmlChar *) path);
 #endif
 
+#if defined(_WIN32)
+	//We must not change the backslashes to slashes if the the path starts with
+	// \\?\
+	//Those paths can be up to 32k characters long.
+	len = xmlStrlen(path);
+	if ((len > 3) && (path[0] == '\\') && (path[1] == '\\') && (path[2] == '?') && (path[3] == '\\') )
+		return xmlStrdup((const xmlChar *) path);
+#endif
+
 	/* sanitize filename starting with // so it can be used as URI */
     if ((path[0] == '/') && (path[1] == '/') && (path[2] != '/'))
         path++;