Assess dangerous or executables also on processing single file

src/NzbDrone.Core/MediaFiles/DownloadedEpisodesImportService.cs

@@ -260,6 +260,26 @@ namespace NzbDrone.Core.MediaFiles
 
             var extension = Path.GetExtension(fileInfo.Name);
 
+            if (FileExtensions.DangerousExtensions.Contains(extension))
+            {
+                return new List<ImportResult>
+                {
+                    new ImportResult(new ImportDecision(new LocalEpisode { Path = fileInfo.FullName },
+                            new ImportRejection(ImportRejectionReason.DangerousFile, "Caution: Found potentially dangerous file")),
+                        $"Caution: Found potentially dangerous file")
+                };
+            }
+
+            if (FileExtensions.ExecutableExtensions.Contains(extension))
+            {
+                return new List<ImportResult>
+                {
+                    new ImportResult(new ImportDecision(new LocalEpisode { Path = fileInfo.FullName },
+                            new ImportRejection(ImportRejectionReason.ExecutableFile, "Caution: Found executable file")),
+                        $"Caution: Found executable file")
+                };
+            }
+
             if (extension.IsNullOrWhiteSpace() || !MediaFileExtensions.Extensions.Contains(extension))
             {
                 _logger.Debug("[{0}] has an unsupported extension: '{1}'", fileInfo.FullName, extension);