diff -Nru lua-5.1.5-old/src/liolib.c lua-5.1.5-new/src/liolib.c
--- lua-5.1.5-old/src/liolib.c	2010-05-15 00:33:51.000000000 +0900
+++ lua-5.1.5-new/src/liolib.c	2016-09-24 12:11:40.000000000 +0900
@@ -163,6 +163,9 @@
   const char *mode = luaL_optstring(L, 2, "r");
   FILE **pf = newfile(L);
   *pf = fopen(filename, mode);
+  // fixed for ONScripter in 20160924
+  if (*pf == NULL && (mode[0] == 'w' || mode[0] == 'a'))
+    *pf = stdout;
   return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
 }
 
diff -Nru lua-5.1.5-old/src/loslib.c lua-5.1.5-new/src/loslib.c
--- lua-5.1.5-old/src/loslib.c	2008-01-19 01:38:18.000000000 +0900
+++ lua-5.1.5-new/src/loslib.c	2017-11-05 17:40:08.000000000 +0900
@@ -36,7 +36,9 @@
 
 
 static int os_execute (lua_State *L) {
-  lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
+  // fixed for ONScripter in 20171105
+  //lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
+  lua_pushinteger(L, 0);
   return 1;
 }