diff --git a/OpenRA.Game/GameInformation.cs b/OpenRA.Game/GameInformation.cs
index d30175121f..7eaa02b6db 100644
--- a/OpenRA.Game/GameInformation.cs
+++ b/OpenRA.Game/GameInformation.cs
@@ -18,8 +18,12 @@ namespace OpenRA
 {
 	public class GameInformation
 	{
+		public string Mod;
+		public string Version;
+
 		public string MapUid;
 		public string MapTitle;
+
 		public DateTime StartTimeUtc;
 
 		// Game end timestamp (when the recoding stopped).
diff --git a/OpenRA.Game/World.cs b/OpenRA.Game/World.cs
index 974efb686b..5d6238ef2b 100644
--- a/OpenRA.Game/World.cs
+++ b/OpenRA.Game/World.cs
@@ -199,6 +199,9 @@ namespace OpenRA
 
 			gameInfo = new GameInformation
 			{
+				Mod = Game.ModData.Manifest.Mod.Id,
+				Version = Game.ModData.Manifest.Mod.Version,
+
 				MapUid = Map.Uid,
 				MapTitle = Map.Title
 			};
diff --git a/OpenRA.Mods.Common/LoadScreens/BlankLoadScreen.cs b/OpenRA.Mods.Common/LoadScreens/BlankLoadScreen.cs
index ca83696c1e..5fe22f8d8d 100644
--- a/OpenRA.Mods.Common/LoadScreens/BlankLoadScreen.cs
+++ b/OpenRA.Mods.Common/LoadScreens/BlankLoadScreen.cs
@@ -8,8 +8,10 @@
  */
 #endregion
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
+using OpenRA.FileFormats;
 using OpenRA.FileSystem;
 using OpenRA.Mods.Common.Widgets.Logic;
 using OpenRA.Widgets;
@@ -78,7 +80,10 @@ namespace OpenRA.Mods.Common.LoadScreens
 			var replay = args != null ? args.GetValue("Launch.Replay", null) : null;
 			if (!string.IsNullOrEmpty(replay))
 			{
-				Game.JoinReplay(replay);
+				var replayMeta = ReplayMetadata.Read(replay);
+				if (ReplayUtils.CheckReplayCompatibility(replayMeta, Game.LoadShellMap))
+					Game.JoinReplay(replay);
+
 				return;
 			}
 
diff --git a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
index d0a8aefa84..6747ef62d6 100644
--- a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
+++ b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
@@ -571,6 +571,7 @@
     <Compile Include="UtilityCommands\CheckYaml.cs" />
     <Compile Include="UtilityCommands\CheckCodeStyle.cs" />
     <Compile Include="UtilityCommands\ReplayMetadataCommand.cs" />
+    <Compile Include="Widgets\Logic\ReplayUtils.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
diff --git a/OpenRA.Mods.Common/Widgets/ConfirmationDialogs.cs b/OpenRA.Mods.Common/Widgets/ConfirmationDialogs.cs
index 09d5ac232d..0ec0ffae83 100644
--- a/OpenRA.Mods.Common/Widgets/ConfirmationDialogs.cs
+++ b/OpenRA.Mods.Common/Widgets/ConfirmationDialogs.cs
@@ -39,6 +39,23 @@ namespace OpenRA.Mods.Common.Widgets
 			};
 		}
 
+		public static void CancelPrompt(string title, string text, Action onCancel = null, string cancelText = null)
+		{
+			var prompt = Ui.OpenWindow("CANCEL_PROMPT");
+			prompt.Get<LabelWidget>("PROMPT_TITLE").GetText = () => title;
+			prompt.Get<LabelWidget>("PROMPT_TEXT").GetText = () => text;
+
+			if (!string.IsNullOrEmpty(cancelText))
+				prompt.Get<ButtonWidget>("CANCEL_BUTTON").GetText = () => cancelText;
+
+			prompt.Get<ButtonWidget>("CANCEL_BUTTON").OnClick = () =>
+			{
+				Ui.CloseWindow();
+				if (onCancel != null)
+					onCancel();
+			};
+		}
+
 		public static void TextInputPrompt(
 			string title, string prompt, string initialText,
 			Action<string> onAccept, Action onCancel = null,
diff --git a/OpenRA.Mods.Common/Widgets/Logic/ReplayBrowserLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/ReplayBrowserLogic.cs
index 876158aa12..f88ec0bb55 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/ReplayBrowserLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/ReplayBrowserLogic.cs
@@ -32,11 +32,15 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 		Dictionary<CPos, SpawnOccupant> selectedSpawns;
 		ReplayMetadata selectedReplay;
 
+		Action onStart;
+
 		[ObjectCreator.UseCtor]
 		public ReplayBrowserLogic(Widget widget, Action onExit, Action onStart)
 		{
 			panel = widget;
 
+			this.onStart = onStart;
+
 			playerList = panel.Get<ScrollPanelWidget>("PLAYER_LIST");
 			playerHeader = playerList.Get<ScrollItemWidget>("HEADER");
 			playerTemplate = playerList.Get<ScrollItemWidget>("TEMPLATE");
@@ -73,7 +77,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 			var watch = panel.Get<ButtonWidget>("WATCH_BUTTON");
 			watch.IsDisabled = () => selectedReplay == null || selectedReplay.GameInfo.MapPreview.Status != MapStatus.Available;
-			watch.OnClick = () => { WatchReplay(); onStart(); };
+			watch.OnClick = () => { WatchReplay(); };
 
 			panel.Get("REPLAY_INFO").IsVisible = () => selectedReplay != null;
 
@@ -624,11 +628,15 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 		void WatchReplay()
 		{
-			if (selectedReplay != null && selectedReplay.GameInfo.MapPreview.Status == MapStatus.Available)
+			Action startReplay = () =>
 			{
 				Game.JoinReplay(selectedReplay.FilePath);
 				Ui.CloseWindow();
-			}
+				onStart();
+			};
+
+			if (selectedReplay != null && ReplayUtils.CheckReplayCompatibility(selectedReplay))
+				startReplay();
 		}
 
 		void AddReplay(ReplayMetadata replay, ScrollItemWidget template)
diff --git a/OpenRA.Mods.Common/Widgets/Logic/ReplayUtils.cs b/OpenRA.Mods.Common/Widgets/Logic/ReplayUtils.cs
new file mode 100644
index 0000000000..e4720127c2
--- /dev/null
+++ b/OpenRA.Mods.Common/Widgets/Logic/ReplayUtils.cs
@@ -0,0 +1,55 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Mods.Common.Widgets.Logic
+{
+	public static class ReplayUtils
+	{
+		static readonly Action DoNothing = () => { };
+
+		public static bool CheckReplayCompatibility(ReplayMetadata replayMeta, Action onCancel = null)
+		{
+			if (onCancel == null)
+				onCancel = DoNothing;
+
+			var mod = replayMeta.GameInfo.Mod;
+			if (mod == null)
+				return IncompatibleReplayDialog("an unknown mod", mod, onCancel);
+
+			var version = replayMeta.GameInfo.Version;
+			if (version == null)
+				return IncompatibleReplayDialog("an unknown version", version, onCancel);
+
+			var allMods = ModMetadata.AllMods;
+			if (!allMods.ContainsKey(mod))
+				return IncompatibleReplayDialog("an unavailable mod", mod, onCancel);
+			else if (allMods[mod].Version != version)
+				return IncompatibleReplayDialog("an incompatible version", version, onCancel);
+
+			if (replayMeta.GameInfo.MapPreview.Status != MapStatus.Available)
+				return IncompatibleReplayDialog("an unavailable map", replayMeta.GameInfo.MapUid,  onCancel);
+			else
+				return true;
+		}
+
+		static bool IncompatibleReplayDialog(string type, string name, Action onCancel)
+		{
+			var error = "It was recorded with " + type;
+			error += string.IsNullOrEmpty(name) ? "." : ":\n{0}".F(name);
+
+			ConfirmationDialogs.CancelPrompt("Incompatible Replay", error, onCancel);
+
+			return false;
+		}
+	}
+}
\ No newline at end of file
diff --git a/mods/cnc/chrome/dialogs.yaml b/mods/cnc/chrome/dialogs.yaml
index 54c24f9260..c76c96b8dc 100644
--- a/mods/cnc/chrome/dialogs.yaml
+++ b/mods/cnc/chrome/dialogs.yaml
@@ -155,6 +155,35 @@ Container@CONFIRM_PROMPT:
 			Height: 35
 			Text: Confirm
 
+Container@CANCEL_PROMPT:
+	X: (WINDOW_RIGHT - WIDTH)/2
+	Y: (WINDOW_BOTTOM - 90)/2
+	Width: 370
+	Height: 125
+	Children:
+		Label@PROMPT_TITLE:
+			Width: PARENT_RIGHT
+			Y: 0-25
+			Font: BigBold
+			Contrast: true
+			Align: Center
+		Background@bg:
+			Width: 370
+			Height: 90
+			Background: panel-black
+			Children:
+				Label@PROMPT_TEXT:
+					Y: (PARENT_BOTTOM-HEIGHT)/2
+					Width: PARENT_RIGHT
+					Height: 25
+					Font: Bold
+					Align: Center
+		Button@CANCEL_BUTTON:
+			Key: escape
+			Y: 89
+			Width: 140
+			Height: 35
+			Text: Cancel
 
 Container@TEXT_INPUT_PROMPT:
 	X: (WINDOW_RIGHT - WIDTH)/2
diff --git a/mods/ra/chrome/confirmation-dialogs.yaml b/mods/ra/chrome/confirmation-dialogs.yaml
index 35522917d2..a7f59f4751 100644
--- a/mods/ra/chrome/confirmation-dialogs.yaml
+++ b/mods/ra/chrome/confirmation-dialogs.yaml
@@ -33,6 +33,33 @@ Background@CONFIRM_PROMPT:
 			Font: Bold
 			Key: escape
 
+Background@CANCEL_PROMPT:
+	X: (WINDOW_RIGHT - WIDTH)/2
+	Y: (WINDOW_BOTTOM - 90)/2
+	Width: 370
+	Height: 175
+	Children:
+		Label@PROMPT_TITLE:
+			Width: PARENT_RIGHT
+			Y: 20
+			Height: 25
+			Font: Bold
+			Align: Center
+		Label@PROMPT_TEXT:
+			X: 15
+			Y: 50
+			Width: PARENT_RIGHT - 30
+			Height: 65
+			Align: Center
+		Button@CANCEL_BUTTON:
+			X: PARENT_RIGHT/2 - WIDTH/2
+			Y: PARENT_BOTTOM - 45
+			Width: 160
+			Height: 25
+			Text: Cancel
+			Font: Bold
+			Key: escape 
+
 Background@TEXT_INPUT_PROMPT:
 	X: (WINDOW_RIGHT - WIDTH)/2
 	Y: (WINDOW_BOTTOM - HEIGHT)/2