diff --git a/source/core/gamecontrol.h b/source/core/gamecontrol.h
index ffa9436dc..ddb84d6c6 100644
--- a/source/core/gamecontrol.h
+++ b/source/core/gamecontrol.h
@@ -197,6 +197,11 @@ inline bool isShareware()
 }
 
 inline bool isDukeLike()
+{
+	return g_gameType & (GAMEFLAG_NAM | GAMEFLAG_NAPALM | GAMEFLAG_WW2GI | GAMEFLAG_DUKE);
+}
+
+inline bool isDukeEngine()
 {
 	return g_gameType & (GAMEFLAG_NAM | GAMEFLAG_NAPALM | GAMEFLAG_WW2GI | GAMEFLAG_DUKE | GAMEFLAG_RRALL);
 }
diff --git a/source/core/initfs.cpp b/source/core/initfs.cpp
index b6c90d107..e8173853a 100644
--- a/source/core/initfs.cpp
+++ b/source/core/initfs.cpp
@@ -402,7 +402,8 @@ void InitFileSystem(TArray<GrpEntry>& groups)
 
 	lfi.dotFilter = LumpFilter;
 
-	if (g_gameType & (GAMEFLAG_DUKE | GAMEFLAG_NAM | GAMEFLAG_NAPALM | GAMEFLAG_WW2GI | GAMEFLAG_RRALL)) lfi.gameTypeFilter.Push("DukeEngine");
+	if (isDukeEngine()) lfi.gameTypeFilter.Push("DukeEngine");
+	if (isDukeLike()) lfi.gameTypeFilter.Push("DukeLike");
 
 	lfi.postprocessFunc = [&]()
 	{
diff --git a/source/core/maploader.cpp b/source/core/maploader.cpp
index 76373c49a..59c8b8074 100644
--- a/source/core/maploader.cpp
+++ b/source/core/maploader.cpp
@@ -869,7 +869,7 @@ void MarkMap()
 	{
 		GC::Mark(sect.firstEntry);
 		GC::Mark(sect.lastEntry);
-		if (isDukeLike()) GC::Mark(sect.hitagactor);
+		if (isDukeEngine()) GC::Mark(sect.hitagactor);
 		else if (isBlood())
 		{
 			GC::Mark(sect.upperLink);
diff --git a/source/core/savegamehelp.cpp b/source/core/savegamehelp.cpp
index 675ce1f17..b2400824f 100644
--- a/source/core/savegamehelp.cpp
+++ b/source/core/savegamehelp.cpp
@@ -103,7 +103,7 @@ static void SerializeGlobals(FSerializer& arc)
 static void SerializeSession(FSerializer& arc)
 {
 	// In Duke we now have reliable sound names.
-	if (isDukeLike()) arc.SetUniqueSoundNames();	
+	if (isDukeEngine()) arc.SetUniqueSoundNames();	
 
 	arc.ReadObjects(false);
 	SerializeMap(arc);
@@ -489,7 +489,7 @@ FSerializer &Serialize(FSerializer &arc, const char *key, sectortype &c, sectort
 			("exflags", c.exflags, def->exflags);
 
 		// Save the extensions only when playing their respective games.
-		if (isDukeLike())
+		if (isDukeEngine())
 		{
 			arc("keyinfo", c.keyinfo, def->keyinfo)
 				("shadedsector", c.shadedsector, def->shadedsector)
diff --git a/wadsrc/static/filter/duke/sndinfo.txt b/wadsrc/static/filter/dukelike/sndinfo.txt
similarity index 100%
rename from wadsrc/static/filter/duke/sndinfo.txt
rename to wadsrc/static/filter/dukelike/sndinfo.txt
diff --git a/wadsrc/static/filter/redneck/sndinfo.txt b/wadsrc/static/filter/redneck/sndinfo.txt
index 74ce8e4b7..4d3457f2c 100644
--- a/wadsrc/static/filter/redneck/sndinfo.txt
+++ b/wadsrc/static/filter/redneck/sndinfo.txt
@@ -199,13 +199,13 @@ $conreserve BIKEJMPL     190
 $conreserve BIKELAND     191
 $conreserve JACKJMP1     192
 $conreserve JACKJMP2     193
-$conreserve FIRE_CRACKLE       =194
-$conreserve BONUS_SPEECH1      =195
-$conreserve BONUS_SPEECH2      =196
-$conreserve BONUS_SPEECH3      =197
+$conreserve FIRE_CRACKLE       194
+$conreserve BONUS_SPEECH1      195
+$conreserve BONUS_SPEECH2      196
+$conreserve BONUS_SPEECH3      197
 $conreserve E2L4         198
-$conreserve BONUS_SPEECH4      =199
-$conreserve PLAYER_LAND_HURT     =200
+$conreserve BONUS_SPEECH4      199
+$conreserve PLAYER_LAND_HURT     200
 $conreserve JACKATK2     201
 $conreserve JACKPAIN     202
 $conreserve LN_BITCH     203
@@ -216,7 +216,7 @@ $conreserve LN_PAIN4     207
 $conreserve LN_SLOW      208
 $conreserve LN_PAIN4A    209
 $conreserve JUG          210
-$conreserve PLAYER_LONGTERM_PAIN =211
+$conreserve PLAYER_LONGTERM_PAIN 211
 $conreserve MONITOR      212
 $conreserve JACKATK1     213
 $conreserve BIKEUP       214