diff --git a/engines/advancedDetector.cpp b/engines/advancedDetector.cpp
index 91e408101eb..a6f0ef6b936 100644
--- a/engines/advancedDetector.cpp
+++ b/engines/advancedDetector.cpp
@@ -171,7 +171,7 @@ DetectedGame AdvancedMetaEngineDetection::toDetectedGame(const ADDetectedGame &a
 		extra = desc->extra;
 	}
 
-	DetectedGame game(getEngineId(), desc->gameId, title, desc->language, desc->platform, extra);
+	DetectedGame game(getEngineId(), desc->gameId, title, desc->language, desc->platform, extra, desc->flags & ADGF_UNSUPPORTED);
 	game.hasUnknownFiles = adGame.hasUnknownFiles;
 	game.matchedFiles = adGame.matchedFiles;
 	game.preferredTarget = generatePreferredTarget(desc, _maxAutogenLength);
@@ -181,6 +181,8 @@ DetectedGame AdvancedMetaEngineDetection::toDetectedGame(const ADDetectedGame &a
 		game.gameSupportLevel = kUnstableGame;
 	else if (desc->flags & ADGF_TESTING)
 		game.gameSupportLevel = kTestingGame;
+	else if (desc->flags & ADGF_UNSUPPORTED)
+		game.gameSupportLevel = kUnupportedGame;
 
 	game.setGUIOptions(desc->guiOptions + _guiOptions);
 	game.appendGUIOptions(getGameGUIOptionsDescriptionLanguage(desc->language));
@@ -379,6 +381,11 @@ Common::Error AdvancedMetaEngineDetection::createInstance(OSystem *syst, Engine
 			&& !Engine::warnUserAboutUnsupportedGame())
 		return Common::kUserCanceled;
 
+	if (gameDescriptor.gameSupportLevel == kUnupportedGame) {
+		Engine::errorUnsupportedGame(gameDescriptor.extra);
+		return Common::kUserCanceled;
+	}
+
 	debug(2, "Running %s", gameDescriptor.description.c_str());
 	initSubSystems(agdDesc.desc);
 
diff --git a/engines/advancedDetector.h b/engines/advancedDetector.h
index 54ae73e3e43..ecb7467c60a 100644
--- a/engines/advancedDetector.h
+++ b/engines/advancedDetector.h
@@ -67,11 +67,12 @@ struct ADGameFileDescription {
 
 enum ADGameFlags {
 	ADGF_NO_FLAGS        =  0,
-	ADGF_REMASTERED      = (1 << 19), ///< add "-remastered' to gameid
-	ADGF_AUTOGENTARGET   = (1 << 20), ///< automatically generate gameid from extra
-	ADGF_UNSTABLE        = (1 << 21), ///< flag to designate not yet officially-supported games that are not fit for public testing
-	ADGF_TESTING         = (1 << 22), ///< flag to designate not yet officially-supported games that are fit for public testing
-	ADGF_PIRATED         = (1 << 23), ///< flag to designate well known pirated versions with cracks
+	ADGF_REMASTERED      = (1 << 18), ///< add "-remastered' to gameid
+	ADGF_AUTOGENTARGET   = (1 << 19), ///< automatically generate gameid from extra
+	ADGF_UNSTABLE        = (1 << 20), ///< flag to designate not yet officially-supported games that are not fit for public testing
+	ADGF_TESTING         = (1 << 21), ///< flag to designate not yet officially-supported games that are fit for public testing
+	ADGF_PIRATED         = (1 << 22), ///< flag to designate well known pirated versions with cracks
+	ADGF_UNSUPPORTED     = (1 << 23), ///< flag to mark certain versions (like fan translations) not to be run for various reasons. A custom message can be provided in the ADGameDescription::extra field.
 	ADGF_ADDENGLISH      = (1 << 24), ///< always add English as language option
 	ADGF_MACRESFORK      = (1 << 25), ///< the md5 for this entry will be calculated from the resource fork
 	ADGF_USEEXTRAASTITLE = (1 << 26), ///< Extra field value will be used as main game title, not gameid
diff --git a/engines/engine.cpp b/engines/engine.cpp
index 34438756d29..197eb64c58a 100644
--- a/engines/engine.cpp
+++ b/engines/engine.cpp
@@ -654,6 +654,13 @@ bool Engine::warnUserAboutUnsupportedGame() {
 	return true;
 }
 
+void Engine::errorUnsupportedGame(Common::String &extraMsg) {
+	Common::String message = extraMsg.empty() ? _("This game is not supported.") : _("This game is not supported for the following reason:\n\n");
+	message += _(extraMsg);
+	message += "\n\n";
+	GUI::MessageDialog(message).runModal();
+}
+
 uint32 Engine::getTotalPlayTime() const {
 	if (!_pauseLevel)
 		return _system->getMillis() - _engineStartTime;
diff --git a/engines/engine.h b/engines/engine.h
index 97444c1a2e8..8d82b592d94 100644
--- a/engines/engine.h
+++ b/engines/engine.h
@@ -428,6 +428,14 @@ public:
 	 */
 	static bool warnUserAboutUnsupportedGame();
 
+	/**
+	 * Display an error message to the user that the game is not supported.
+	 *
+	 * @param extraMsg    This will be appended to the default message.
+	 *						
+	 */
+	static void errorUnsupportedGame(Common::String &extraMsg);
+
 	/**
 	 * Get the total play time.
 	 *
diff --git a/engines/game.cpp b/engines/game.cpp
index 96802acfec7..6e3db9cf6ef 100644
--- a/engines/game.cpp
+++ b/engines/game.cpp
@@ -76,7 +76,7 @@ DetectedGame::DetectedGame(const Common::String &engine, const PlainGameDescript
 	description = pgd.description;
 }
 
-DetectedGame::DetectedGame(const Common::String &engine, const Common::String &id, const Common::String &d, Common::Language l, Common::Platform p, const Common::String &ex) :
+DetectedGame::DetectedGame(const Common::String &engine, const Common::String &id, const Common::String &d, Common::Language l, Common::Platform p, const Common::String &ex, bool unsupported) :
 		engineId(engine),
 		hasUnknownFiles(false),
 		canBeAdded(true),
@@ -90,7 +90,7 @@ DetectedGame::DetectedGame(const Common::String &engine, const Common::String &i
 	extra = ex;
 
 	// Append additional information, if set, to the description.
-	description += updateDesc();
+	description += updateDesc(unsupported);
 }
 
 void DetectedGame::setGUIOptions(const Common::String &guioptions) {
@@ -104,10 +104,10 @@ void DetectedGame::appendGUIOptions(const Common::String &str) {
 	_guiOptions += str;
 }
 
-Common::String DetectedGame::updateDesc() const {
+Common::String DetectedGame::updateDesc(bool skipExtraField) const {
 	const bool hasCustomLanguage = (language != Common::UNK_LANG);
 	const bool hasCustomPlatform = (platform != Common::kPlatformUnknown);
-	const bool hasExtraDesc = !extra.empty();
+	const bool hasExtraDesc = (!extra.empty() && !skipExtraField);
 
 	// Adapt the description string if custom platform/language is set.
 	Common::String descr;
diff --git a/engines/game.h b/engines/game.h
index 8d0b013e12a..17ff2cc76c9 100644
--- a/engines/game.h
+++ b/engines/game.h
@@ -83,8 +83,9 @@ typedef Common::Array<QualifiedGameDescriptor> QualifiedGameList;
  */
 enum GameSupportLevel {
 	kStableGame = 0, // the game is fully supported
-	kTestingGame, // the game is not supposed to end up in releases yet but is ready for public testing
-	kUnstableGame // the game is not even ready for public testing yet
+	kTestingGame,    // the game is not supposed to end up in releases yet but is ready for public testing
+	kUnstableGame,   // the game is not even ready for public testing yet
+	kUnupportedGame  // we don't want to support the game
 };
 
 
@@ -118,7 +119,8 @@ struct DetectedGame {
 	               const Common::String &description,
 	               Common::Language language = Common::UNK_LANG,
 	               Common::Platform platform = Common::kPlatformUnknown,
-	               const Common::String &extra = Common::String());
+	               const Common::String &extra = Common::String(),
+	               bool unsupported = false);
 
 	void setGUIOptions(const Common::String &options);
 	void appendGUIOptions(const Common::String &str);
@@ -183,7 +185,7 @@ private:
 	 * Values that are missing are omitted, so e.g. (EXTRA/LANG) would be
 	 * added if no platform has been specified but a language and an extra string.
 	 */
-	Common::String updateDesc() const;
+	Common::String updateDesc(bool skipExtraField) const;
 
 	Common::String _guiOptions;
 };