Index: ps/trunk/source/ps/Replay.h
===================================================================
--- ps/trunk/source/ps/Replay.h
+++ ps/trunk/source/ps/Replay.h
@@ -18,6 +18,7 @@
 #ifndef INCLUDED_REPLAY
 #define INCLUDED_REPLAY
 
+#include "ps/CStr.h"
 #include "scriptinterface/ScriptTypes.h"
 
 struct SimulationCommand;
@@ -101,6 +102,8 @@
 
 private:
 	std::istream* m_Stream;
+	CStr ModListToString(const std::vector<std::vector<CStr>>& list) const;
+	void CheckReplayMods(const ScriptInterface& scriptInterface, JS::HandleValue attribs) const;
 };
 
 #endif // INCLUDED_REPLAY
Index: ps/trunk/source/ps/Replay.cpp
===================================================================
--- ps/trunk/source/ps/Replay.cpp
+++ ps/trunk/source/ps/Replay.cpp
@@ -125,6 +125,47 @@
 	ENSURE(m_Stream->good());
 }
 
+CStr CReplayPlayer::ModListToString(const std::vector<std::vector<CStr>>& list) const
+{
+	CStr text;
+	for (const std::vector<CStr>& mod : list)
+		text += mod[0] + " (" + mod[1] + ")\n";
+	return text;
+}
+
+void CReplayPlayer::CheckReplayMods(const ScriptInterface& scriptInterface, JS::HandleValue attribs) const
+{
+	JSContext* cx = scriptInterface.GetContext();
+	JSAutoRequest rq(cx);
+
+	std::vector<std::vector<CStr>> replayMods;
+	scriptInterface.GetProperty(attribs, "mods", replayMods);
+
+	std::vector<std::vector<CStr>> enabledMods;
+	JS::RootedValue enabledModsJS(cx, Mod::GetLoadedModsWithVersions(scriptInterface));
+	scriptInterface.FromJSVal(cx, enabledModsJS, enabledMods);
+
+	CStr warn;
+	if (replayMods.size() != enabledMods.size())
+		warn = "The number of enabled mods does not match the mods of the replay.";
+	else
+		for (size_t i = 0; i < replayMods.size(); ++i)
+		{
+			if (replayMods[i][0] != enabledMods[i][0])
+			{
+				warn = "The enabled mods don't match the mods of the replay.";
+				break;
+			}
+			else if (replayMods[i][1] != enabledMods[i][1])
+			{
+				warn = "The mod '" + replayMods[i][0] + "' with version '" + replayMods[i][1] + "' is required by the replay file, but version '" + enabledMods[i][1] + "' is present!";
+				break;
+			}
+		}
+
+	if (!warn.empty())
+		LOGWARNING("%s\nThe mods of the replay are:\n%s\nThese mods are enabled:\n%s", warn, ModListToString(replayMods), ModListToString(enabledMods));
+}
 void CReplayPlayer::Replay(bool serializationtest, int rejointestturn, bool ooslog)
 {
 	ENSURE(m_Stream);
@@ -162,6 +203,7 @@
 	JSContext* cx = g_Game->GetSimulation2()->GetScriptInterface().GetContext();
 	JSAutoRequest rq(cx);
 	std::string type;
+
 	while ((*m_Stream >> type).good())
 	{
 		if (type == "start")
@@ -171,16 +213,7 @@
 			JS::RootedValue attribs(cx);
 			ENSURE(g_Game->GetSimulation2()->GetScriptInterface().ParseJSON(line, &attribs));
 
-			std::vector<CStr> replayModList;
-			g_Game->GetSimulation2()->GetScriptInterface().GetProperty(attribs, "mods", replayModList);
-
-			for (const CStr& mod : replayModList)
-				if (mod != "user" && std::find(g_modsLoaded.begin(), g_modsLoaded.end(), mod) == g_modsLoaded.end())
-					LOGWARNING("The mod '%s' is required by the replay file, but wasn't passed as an argument!", mod);
-
-			for (const CStr& mod : g_modsLoaded)
-				if (mod != "user" && std::find(replayModList.begin(), replayModList.end(), mod) == replayModList.end())
-					LOGWARNING("The mod '%s' wasn't used when creating this replay file, but was passed as an argument!", mod);
+			CheckReplayMods(g_Game->GetSimulation2()->GetScriptInterface(), attribs);
 
 			g_Game->StartGame(&attribs, "");
 
Index: ps/trunk/source/scriptinterface/ScriptConversions.cpp
===================================================================
--- ps/trunk/source/scriptinterface/ScriptConversions.cpp
+++ ps/trunk/source/scriptinterface/ScriptConversions.cpp
@@ -1,4 +1,4 @@
-/* Copyright (C) 2017 Wildfire Games.
+/* Copyright (C) 2018 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -307,7 +307,10 @@
 JSVAL_VECTOR(u16)
 JSVAL_VECTOR(std::string)
 JSVAL_VECTOR(std::wstring)
+JSVAL_VECTOR(std::vector<std::wstring>)
 JSVAL_VECTOR(CStr8)
+JSVAL_VECTOR(std::vector<CStr8>)
+JSVAL_VECTOR(std::vector<std::string>)
 
 
 class IComponent;