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diff --git a/engines/glk/frotz/detection.cpp b/engines/glk/frotz/detection.cpp
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+++ b/engines/glk/frotz/detection.cpp
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "glk/frotz/detection.h"
+#include "common/file.h"
+#include "common/md5.h"
+
+#include "glk/frotz/detection_tables.h"
+
+namespace Gargoyle {
+namespace Frotz {
+
+bool FrotzMetaEngine::detectGames(const Common::FSList &fslist, DetectedGames &gameList) {
+	const char *const EXTENSIONS[9] = { ".z1", ".z2", ".z3", ".z4", ".z5", ".z6", ".z7", ".z8", ".zblorb" };
+
+	// Loop through the files of the folder
+	for (Common::FSList::const_iterator file = fslist.begin(); file != fslist.end(); ++file) {
+		// Check for a recognised filename
+		if (file->isDirectory())
+			continue;
+		Common::String filename = file->getName();
+		bool hasExt = false;
+		for (int idx = 0; idx < 9 && !hasExt; ++idx)
+			hasExt = filename.hasSuffixIgnoreCase(EXTENSIONS[idx]);
+		if (!hasExt)
+			continue;
+
+		// Open up the file and calculate the md5
+		Common::File gameFile;
+		if (!gameFile.open(*file))
+			continue;
+		Common::String md5 = Common::computeStreamMD5AsString(gameFile, 5000);
+		size_t filesize = gameFile.size();
+		gameFile.close();
+
+		// Check for known game
+		const FrotzGameDescription *p = FROTZ_GAMES;
+		while (p->_gameId && p->_md5 && (md5 != p->_md5 || filesize != p->_filesize))
+			++p;
+
+		DetectedGame gd;
+		if (!p->_gameId) {
+			// Generic .dat files don't get reported as matches unless they have a known md5
+			if (filename.hasSuffixIgnoreCase(".dat"))
+				continue;
+
+			warning("Uknown zcode game %s - %s %d", filename.c_str(), md5.c_str(), filesize);
+			gd = DetectedGame("zcode", "Unrecognised zcode game", Common::UNK_LANG, Common::kPlatformUnknown);
+		} else {
+			gd = DetectedGame(p->_gameId, p->_description, p->_language, Common::kPlatformUnknown, p->_extra);
+		}
+
+		gd.addExtraEntry("filename", filename);
+		gameList.push_back(gd);
+	}
+
+	return !gameList.empty();
+}
+
+} // End of namespace Frotz
+} // End of namespace Gargoyle