diff --git a/osu.Game/IPC/ArchiveImportIPCChannel.cs b/osu.Game/IPC/ArchiveImportIPCChannel.cs
index 6783b9712c..fa8168c1de 100644
--- a/osu.Game/IPC/ArchiveImportIPCChannel.cs
+++ b/osu.Game/IPC/ArchiveImportIPCChannel.cs
@@ -37,7 +37,7 @@ namespace osu.Game.IPC
                 return;
             }
 
-            if (importer.HandledExtensions.Contains(Path.GetExtension(path)))
+            if (importer.HandledExtensions.Contains(Path.GetExtension(path)?.ToLowerInvariant()))
                 importer.Import(path);
         }
     }
diff --git a/osu.Game/OsuGameBase.cs b/osu.Game/OsuGameBase.cs
index ca989bf0d5..73c970ce5d 100644
--- a/osu.Game/OsuGameBase.cs
+++ b/osu.Game/OsuGameBase.cs
@@ -243,7 +243,7 @@ namespace osu.Game
 
         public void Import(params string[] paths)
         {
-            var extension = Path.GetExtension(paths.First());
+            var extension = Path.GetExtension(paths.First())?.ToLowerInvariant();
 
             foreach (var importer in fileImporters)
                 if (importer.HandledExtensions.Contains(extension)) importer.Import(paths);