diff --git a/src/app/script/engine.cpp b/src/app/script/engine.cpp
index 9fc86b8da..69b690930 100644
--- a/src/app/script/engine.cpp
+++ b/src/app/script/engine.cpp
@@ -14,6 +14,7 @@
 #include "app/console.h"
 #include "app/script/luacpp.h"
 #include "base/chrono.h"
+#include "base/file_handle.h"
 #include "base/fs.h"
 #include "base/fstream_path.h"
 #include "doc/anidir.h"
@@ -109,6 +110,13 @@ void register_sprites_class(lua_State* L);
 void register_tag_class(lua_State* L);
 void register_tags_class(lua_State* L);
 
+// We use our own fopen() that supports Unicode filename on Windows
+extern "C" FILE* lua_user_fopen(const char* fname,
+                                const char* mode)
+{
+  return base::open_file_raw(fname, mode);
+}
+
 Engine::Engine()
   : L(luaL_newstate())
   , m_delegate(nullptr)
@@ -122,12 +130,13 @@ Engine::Engine()
   luaL_requiref(L, LUA_GNAME, luaopen_base, 1);
   luaL_requiref(L, LUA_COLIBNAME, luaopen_coroutine, 1);
   luaL_requiref(L, LUA_TABLIBNAME, luaopen_table, 1);
+  luaL_requiref(L, LUA_IOLIBNAME, luaopen_io, 1);
   luaL_requiref(L, LUA_OSLIBNAME, luaopen_os, 1);
   luaL_requiref(L, LUA_STRLIBNAME, luaopen_string, 1);
   luaL_requiref(L, LUA_MATHLIBNAME, luaopen_math, 1);
   luaL_requiref(L, LUA_UTF8LIBNAME, luaopen_utf8, 1);
   luaL_requiref(L, LUA_DBLIBNAME, luaopen_debug, 1);
-  lua_pop(L, 8);
+  lua_pop(L, 9);
 
   // Overwrite Lua functions
   lua_register(L, "print", print);