diff --git a/Info.plist.template b/Info.plist.template
index 673c5ae26..977efd9e8 100644
--- a/Info.plist.template
+++ b/Info.plist.template
@@ -585,6 +585,8 @@
 				<string>sxd</string>
 				<string>sxd2</string>
 				<string>sxd3</string>
+				<string>szd1</string>
+				<string>szd3</string>
 				<string>tad</string>
 				<string>tec</string>
 				<string>tgq</string>
@@ -765,6 +767,8 @@
 			<array>
 				<string>mp4</string>
 				<string>m4a</string>
+				<string>m4b</string>
+				<string>m4r</string>
 			</array>
 			<key>CFBundleTypeIconFile</key>
 			<string>m4a.icns</string>
diff --git a/Plugins/FFMPEG/FFMPEGDecoder.m b/Plugins/FFMPEG/FFMPEGDecoder.m
index 3644d8b47..f00bf2169 100644
--- a/Plugins/FFMPEG/FFMPEGDecoder.m
+++ b/Plugins/FFMPEG/FFMPEGDecoder.m
@@ -1009,7 +1009,7 @@ static uint8_t reverse_bits[0x100];
 	return @[
 		@[@"Windows Media Audio File", @"song.icns", @"wma", @"asf"],
 		@[@"TAK Audio File", @"song.icns", @"tak"],
-		@[@"MPEG-4 Audio File", @"m4a.icns", @"mp4", @"m4a"],
+		@[@"MPEG-4 Audio File", @"m4a.icns", @"mp4", @"m4a", @"m4b", @"m4r"],
 		@[@"MPEG-4 AAC Audio File", @"song.icns", @"aac"],
 		@[@"MPEG Audio File", @"mp3.icns", @"mp3", @"m2a", @"mpa"],
 		@[@"Monkey's Audio File", @"ape.icns", @"ape"],