Speicals go in Specials folder

src/NzbDrone.Core.Test/OrganizerTests/BuildFilePathFixture.cs

@@ -31,6 +31,7 @@ namespace NzbDrone.Core.Test.OrganizerTests
         [TestCase("30 Rock - S01E05 - Episode Title", 1, false, "Season %0s", @"C:\Test\30 Rock\30 Rock - S01E05 - Episode Title.mkv")]
         [TestCase("30 Rock - S01E05 - Episode Title", 1, false, "Season %s", @"C:\Test\30 Rock\30 Rock - S01E05 - Episode Title.mkv")]
         [TestCase("30 Rock - S01E05 - Episode Title", 1, true, "ReallyUglySeasonFolder %s", @"C:\Test\30 Rock\ReallyUglySeasonFolder 1\30 Rock - S01E05 - Episode Title.mkv")]
+        [TestCase("30 Rock - S00E05 - Episode Title", 0, true, "Season %s", @"C:\Test\30 Rock\Specials\30 Rock - S00E05 - Episode Title.mkv")]
         public void CalculateFilePath_SeasonFolder_SingleNumber(string filename, int seasonNumber, bool useSeasonFolder, string seasonFolderFormat, string expectedPath)
         {
             var fakeSeries = Builder<Series>.CreateNew()
@@ -41,7 +42,7 @@ namespace NzbDrone.Core.Test.OrganizerTests
 
             Mocker.GetMock<IConfigService>().Setup(e => e.SeasonFolderFormat).Returns(seasonFolderFormat);
 
-            Subject.BuildFilePath(fakeSeries, 1, filename, ".mkv").Should().Be(expectedPath.AsOsAgnostic());
+            Subject.BuildFilePath(fakeSeries, seasonNumber, filename, ".mkv").Should().Be(expectedPath.AsOsAgnostic());
         }
     }
 }

src/NzbDrone.Core/Organizer/FileNameBuilder.cs

@@ -170,12 +170,22 @@ namespace NzbDrone.Core.Organizer
             string path = series.Path;
             if (series.SeasonFolder)
             {
-                var seasonFolder = _configService.SeasonFolderFormat
+                string seasonFolder;
+
+                if (seasonNumber == 0)
+                {
+                    seasonFolder = "Specials";
+                }
+
+                else
+                {
+                    seasonFolder = _configService.SeasonFolderFormat
                                                  .Replace("%sn", series.Title)
                                                  .Replace("%s.n", series.Title.Replace(' ', '.'))
                                                  .Replace("%s_n", series.Title.Replace(' ', '_'))
                                                  .Replace("%0s", seasonNumber.ToString("00"))
                                                  .Replace("%s", seasonNumber.ToString());
+                }
 
                 path = Path.Combine(path, seasonFolder);
             }