diff --git a/osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs b/osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs
index 0e3a62e8fa..ef1dbc0488 100644
--- a/osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs
+++ b/osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs
@@ -369,7 +369,7 @@ namespace osu.Game.Beatmaps.Formats
                     // Some very old beatmaps had incorrect type specifications for their backgrounds (ie. using 1 for VIDEO
                     // instead of 0 for BACKGROUND). To handle this gracefully, check the file extension against known supported
                     // video extensions and handle similar to a background if it doesn't match.
-                    if (!OsuGameBase.VIDEO_EXTENSIONS.Contains(Path.GetExtension(filename).ToUpperInvariant()))
+                    if (!OsuGameBase.VIDEO_EXTENSIONS.Contains(Path.GetExtension(filename).ToLowerInvariant()))
                     {
                         beatmap.BeatmapInfo.Metadata.BackgroundFile = filename;
                     }
diff --git a/osu.Game/Beatmaps/Formats/LegacyStoryboardDecoder.cs b/osu.Game/Beatmaps/Formats/LegacyStoryboardDecoder.cs
index 2eb496a798..df5d3edb55 100644
--- a/osu.Game/Beatmaps/Formats/LegacyStoryboardDecoder.cs
+++ b/osu.Game/Beatmaps/Formats/LegacyStoryboardDecoder.cs
@@ -114,7 +114,7 @@ namespace osu.Game.Beatmaps.Formats
                         //
                         // This avoids potential weird crashes when ffmpeg attempts to parse an image file as a video
                         // (see https://github.com/ppy/osu/issues/22829#issuecomment-1465552451).
-                        if (!OsuGameBase.VIDEO_EXTENSIONS.Contains(Path.GetExtension(path).ToUpperInvariant()))
+                        if (!OsuGameBase.VIDEO_EXTENSIONS.Contains(Path.GetExtension(path).ToLowerInvariant()))
                             break;
 
                         storyboard.GetLayer("Video").Add(new StoryboardVideo(path, offset));
diff --git a/osu.Game/Graphics/UserInterfaceV2/OsuFileSelector.cs b/osu.Game/Graphics/UserInterfaceV2/OsuFileSelector.cs
index 825b1a5636..7097102335 100644
--- a/osu.Game/Graphics/UserInterfaceV2/OsuFileSelector.cs
+++ b/osu.Game/Graphics/UserInterfaceV2/OsuFileSelector.cs
@@ -70,7 +70,7 @@ namespace osu.Game.Graphics.UserInterfaceV2
             {
                 get
                 {
-                    if (OsuGameBase.VIDEO_EXTENSIONS.Contains(File.Extension.ToUpperInvariant()))
+                    if (OsuGameBase.VIDEO_EXTENSIONS.Contains(File.Extension.ToLowerInvariant()))
                         return FontAwesome.Regular.FileVideo;
 
                     switch (File.Extension)
diff --git a/osu.Game/OsuGameBase.cs b/osu.Game/OsuGameBase.cs
index 2ab6c24af7..34e31b0d61 100644
--- a/osu.Game/OsuGameBase.cs
+++ b/osu.Game/OsuGameBase.cs
@@ -71,7 +71,7 @@ namespace osu.Game
     [Cached(typeof(OsuGameBase))]
     public partial class OsuGameBase : Framework.Game, ICanAcceptFiles, IBeatSyncProvider
     {
-        public static readonly string[] VIDEO_EXTENSIONS = { ".MP4", ".MOV", ".AVI", ".FLV", ".MPG", ".WMV", ".M4V" };
+        public static readonly string[] VIDEO_EXTENSIONS = { ".mp4", ".mov", ".avi", ".flv", ".mpg", ".wmv", ".m4v" };
 
         public const string OSU_PROTOCOL = "osu://";