Fixed: Subtitle extensions should be case-insensitive.

src/NzbDrone.Core/Extras/Lyrics/LyricFileExtensions.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 
 namespace NzbDrone.Core.Extras.Lyrics
@@ -8,7 +9,7 @@ namespace NzbDrone.Core.Extras.Lyrics
 
         static LyricFileExtensions()
         {
-            _fileExtensions = new HashSet<string>
+            _fileExtensions = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
                               {
                                   ".lrc",
                                   ".txt",

src/NzbDrone.Core/Extras/Metadata/Consumers/Xbmc/XbmcMetadata.cs

@@ -103,13 +103,13 @@ namespace NzbDrone.Core.Extras.Metadata.Consumers.Xbmc
                 return metadata;
             }
 
-            if (filename.Equals("artist.nfo", StringComparison.InvariantCultureIgnoreCase))
+            if (filename.Equals("artist.nfo", StringComparison.OrdinalIgnoreCase))
             {
                 metadata.Type = MetadataType.ArtistMetadata;
                 return metadata;
             }
 
-            if (filename.Equals("album.nfo", StringComparison.InvariantCultureIgnoreCase))
+            if (filename.Equals("album.nfo", StringComparison.OrdinalIgnoreCase))
             {
                 metadata.Type = MetadataType.AlbumMetadata;
                 return metadata;
@@ -118,7 +118,7 @@ namespace NzbDrone.Core.Extras.Metadata.Consumers.Xbmc
             var parseResult = Parser.Parser.ParseMusicTitle(filename);
 
             if (parseResult != null &&
-                Path.GetExtension(filename) == ".nfo")
+                Path.GetExtension(filename).Equals(".nfo", StringComparison.OrdinalIgnoreCase))
             {
                 metadata.Type = MetadataType.TrackMetadata;
                 return metadata;

src/NzbDrone.Core/Extras/Others/OtherExtraService.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -42,18 +43,18 @@ namespace NzbDrone.Core.Extras.Others
             return Enumerable.Empty<ExtraFile>();
         }
 
-        public override IEnumerable<ExtraFile> MoveFilesAfterRename(Artist artist, List<TrackFile> episodeFiles)
+        public override IEnumerable<ExtraFile> MoveFilesAfterRename(Artist artist, List<TrackFile> trackFiles)
         {
             var extraFiles = _otherExtraFileService.GetFilesByArtist(artist.Id);
             var movedFiles = new List<OtherExtraFile>();
 
-            foreach (var episodeFile in episodeFiles)
+            foreach (var trackFile in trackFiles)
             {
-                var extraFilesForEpisodeFile = extraFiles.Where(m => m.TrackFileId == episodeFile.Id).ToList();
+                var extraFilesForTrackFile = extraFiles.Where(m => m.TrackFileId == trackFile.Id).ToList();
 
-                foreach (var extraFile in extraFilesForEpisodeFile)
+                foreach (var extraFile in extraFilesForTrackFile)
                 {
-                    movedFiles.AddIfNotNull(MoveFile(artist, episodeFile, extraFile));
+                    movedFiles.AddIfNotNull(MoveFile(artist, trackFile, extraFile));
                 }
             }
 
@@ -65,7 +66,7 @@ namespace NzbDrone.Core.Extras.Others
         public override ExtraFile Import(Artist artist, TrackFile trackFile, string path, string extension, bool readOnly)
         {
             // If the extension is .nfo we need to change it to .nfo-orig
-            if (Path.GetExtension(path).Equals(".nfo"))
+            if (Path.GetExtension(path).Equals(".nfo", StringComparison.OrdinalIgnoreCase))
             {
                 extension += "-orig";
             }

src/NzbDrone.Core/MediaFiles/DiskScanService.cs

@@ -135,7 +135,7 @@ namespace NzbDrone.Core.MediaFiles
             var searchOption = allDirectories ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly;
             var filesOnDisk = _diskProvider.GetFiles(path, searchOption).ToList();
 
-            var mediaFileList = filesOnDisk.Where(file => MediaFileExtensions.Extensions.Contains(Path.GetExtension(file).ToLower()))
+            var mediaFileList = filesOnDisk.Where(file => MediaFileExtensions.Extensions.Contains(Path.GetExtension(file)))
                                            .ToList();
 
             _logger.Trace("{0} files were found in {1}", filesOnDisk.Count, path);
@@ -150,7 +150,7 @@ namespace NzbDrone.Core.MediaFiles
             var searchOption = allDirectories ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly;
             var filesOnDisk = _diskProvider.GetFiles(path, searchOption).ToList();
 
-            var mediaFileList = filesOnDisk.Where(file => !MediaFileExtensions.Extensions.Contains(Path.GetExtension(file).ToLower()))
+            var mediaFileList = filesOnDisk.Where(file => !MediaFileExtensions.Extensions.Contains(Path.GetExtension(file)))
                                            .ToList();
 
             _logger.Trace("{0} files were found in {1}", filesOnDisk.Count, path);

src/NzbDrone.Core/MediaFiles/DownloadedTracksImportService.cs

@@ -1,13 +1,14 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using NLog;
 using NzbDrone.Common.Disk;
 using NzbDrone.Core.DecisionEngine;
+using NzbDrone.Core.Download;
 using NzbDrone.Core.MediaFiles.TrackImport;
-using NzbDrone.Core.Parser;
 using NzbDrone.Core.Music;
-using NzbDrone.Core.Download;
+using NzbDrone.Core.Parser;
 using NzbDrone.Core.Parser.Model;
 
 namespace NzbDrone.Core.MediaFiles
@@ -98,7 +99,7 @@ namespace NzbDrone.Core.MediaFiles
         public bool ShouldDeleteFolder(DirectoryInfo directoryInfo, Artist artist)
         {
             var audioFiles = _diskScanService.GetNonAudioFiles(directoryInfo.FullName);
-            var rarFiles = _diskProvider.GetFiles(directoryInfo.FullName, SearchOption.AllDirectories).Where(f => Path.GetExtension(f) == ".rar");
+            var rarFiles = _diskProvider.GetFiles(directoryInfo.FullName, SearchOption.AllDirectories).Where(f => Path.GetExtension(f).Equals(".rar", StringComparison.OrdinalIgnoreCase));
 
             foreach (var audioFile in audioFiles)
             {

src/NzbDrone.Core/MediaFiles/MediaFileExtensions.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using NzbDrone.Core.Qualities;
 
 
@@ -10,7 +11,7 @@ namespace NzbDrone.Core.MediaFiles
 
         static MediaFileExtensions()
         {
-            _fileExtensions = new Dictionary<string, Quality>
+            _fileExtensions = new Dictionary<string, Quality>(StringComparer.OrdinalIgnoreCase)
             {
                 { ".mp3", Quality.Unknown },
                 { ".m4a", Quality.Unknown },
@@ -19,7 +20,7 @@ namespace NzbDrone.Core.MediaFiles
             };
         }
 
-        public static HashSet<string> Extensions => new HashSet<string>(_fileExtensions.Keys);
+        public static HashSet<string> Extensions => new HashSet<string>(_fileExtensions.Keys, StringComparer.OrdinalIgnoreCase);
 
         public static Quality GetQualityForExtension(string extension)
         {