diff --git a/Emby.Server.Implementations/Library/LibraryManager.cs b/Emby.Server.Implementations/Library/LibraryManager.cs
index 694501d384..855fcc813d 100644
--- a/Emby.Server.Implementations/Library/LibraryManager.cs
+++ b/Emby.Server.Implementations/Library/LibraryManager.cs
@@ -2700,7 +2700,7 @@ namespace Emby.Server.Implementations.Library
                 var current = fileSystemChildren[i];
                 if (current.IsDirectory && _namingOptions.AllExtrasTypesFolderNames.ContainsKey(current.Name))
                 {
-                    var filesInSubFolder = _fileSystem.GetFiles(current.FullName, _namingOptions.VideoFileExtensions, false, false);
+                    var filesInSubFolder = _fileSystem.GetFiles(current.FullName, null, false, false);
                     foreach (var file in filesInSubFolder)
                     {
                         if (!_extraResolver.TryGetExtraTypeForOwner(file.FullName, ownerVideoInfo, out var extraType))
diff --git a/Emby.Server.Implementations/Library/Resolvers/GenericVideoResolver.cs b/Emby.Server.Implementations/Library/Resolvers/GenericVideoResolver.cs
index 9b68386602..b8554bd51c 100644
--- a/Emby.Server.Implementations/Library/Resolvers/GenericVideoResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/GenericVideoResolver.cs
@@ -6,14 +6,14 @@ using MediaBrowser.Controller.Entities;
 namespace Emby.Server.Implementations.Library.Resolvers
 {
     /// <summary>
-    /// Resolves a Path into a Video or Video subclass.
+    /// Resolves a Path into an instance of the <see cref="Video"/> class.
     /// </summary>
     /// <typeparam name="T">The type of item to resolve.</typeparam>
     public class GenericVideoResolver<T> : BaseVideoResolver<T>
         where T : Video, new()
     {
         /// <summary>
-        /// Initializes a new instance of the <see cref="GenericVideoResolver"/> class.
+        /// Initializes a new instance of the <see cref="GenericVideoResolver{T}"/> class.
         /// </summary>
         /// <param name="namingOptions">The naming options.</param>
         public GenericVideoResolver(NamingOptions namingOptions)
diff --git a/tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManager/FindExtrasTests.cs b/tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManager/FindExtrasTests.cs
index 5be111ad95..de44213207 100644
--- a/tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManager/FindExtrasTests.cs
+++ b/tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManager/FindExtrasTests.cs
@@ -108,7 +108,7 @@ public class FindExtrasTests
                     Name = "some trailer.mkv",
                     IsDirectory = false
                 }
-            });
+            }).Verifiable();
 
         _fileSystemMock.Setup(f => f.GetFiles(
                 "/movies/Up/behind the scenes",
@@ -123,7 +123,7 @@ public class FindExtrasTests
                     Name = "the making of Up.mkv",
                     IsDirectory = false
                 }
-            });
+            }).Verifiable();
 
         _fileSystemMock.Setup(f => f.GetFiles(
                 "/movies/Up/theme-music",
@@ -138,17 +138,18 @@ public class FindExtrasTests
                     Name = "theme2.mp3",
                     IsDirectory = false
                 }
-            });
+            }).Verifiable();
 
         var files = paths.Select(p => new FileSystemMetadata
         {
             FullName = p,
             Name = Path.GetFileName(p),
-            IsDirectory = string.IsNullOrEmpty(Path.GetExtension(p))
+            IsDirectory = !Path.HasExtension(p)
         }).ToList();
 
         var extras = _libraryManager.FindExtras(owner, files, new DirectoryService(_fileSystemMock.Object)).OrderBy(e => e.ExtraType).ToList();
 
+        _fileSystemMock.Verify();
         Assert.Equal(6, extras.Count);
         Assert.Equal(ExtraType.Trailer, extras[0].ExtraType);
         Assert.Equal(typeof(Trailer), extras[0].GetType());
@@ -215,6 +216,46 @@ public class FindExtrasTests
         Assert.Equal("/movies/Up/trailer.mkv", extras[0].Path);
     }
 
+    [Fact]
+    public void FindExtras_WrongExtensions_FindsNoExtras()
+    {
+        var owner = new Movie { Name = "Up", Path = "/movies/Up/Up.mkv" };
+        var paths = new List<string>
+        {
+            "/movies/Up/Up.mkv",
+            "/movies/Up/trailer.noext",
+            "/movies/Up/theme.png",
+            "/movies/Up/trailers"
+        };
+
+        var files = paths.Select(p => new FileSystemMetadata
+        {
+            FullName = p,
+            Name = Path.GetFileName(p),
+            IsDirectory = !Path.HasExtension(p)
+        }).ToList();
+
+        _fileSystemMock.Setup(f => f.GetFiles(
+                "/movies/Up/trailers",
+                It.IsAny<string[]>(),
+                false,
+                false))
+            .Returns(new List<FileSystemMetadata>
+            {
+                new()
+                {
+                    FullName = "/movies/Up/trailers/trailer.jpg",
+                    Name = "trailer.jpg",
+                    IsDirectory = false
+                }
+            }).Verifiable();
+
+        var extras = _libraryManager.FindExtras(owner, files, new DirectoryService(_fileSystemMock.Object)).OrderBy(e => e.ExtraType).ToList();
+
+        _fileSystemMock.Verify();
+        Assert.Empty(extras);
+    }
+
     [Fact]
     public void FindExtras_SeriesWithTrailers_FindsCorrectExtras()
     {