From a8faf239a16d7da1191530269dcee23f073eb88c Mon Sep 17 00:00:00 2001
From: Ben Castricum
Date: Tue, 31 Oct 2017 10:37:29 +0100
Subject: SCUMM: Prevent false detection of Steam games

---
 engines/scumm/detection.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/engines/scumm/detection.cpp b/engines/scumm/detection.cpp
index cd2055e017..0aa993a53a 100644
--- a/engines/scumm/detection.cpp
+++ b/engines/scumm/detection.cpp
@@ -660,6 +660,12 @@ static void detectGames(const Common::FSList &fslist, Common::List<DetectorResul
 		if (d.md5Entry)
 			continue;
 
+		// Prevent executables being detected as Steam variant. If we don't
+		// know the md5, then it's just the regular executable. Otherwise we
+		// will most likely fail on trying read the index from the executable.
+		// Fixes bug #10290
+		if (gfp->genMethod == kGenRoomNumSteam || gfp->genMethod == kGenDiskNumSteam)
+			continue;
 
 		//  ____            _     ____
 		// |  _ \ __ _ _ __| |_  |___ \ *
-- 
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