diff --git a/src/NexusMods.Library/AddLibraryFileJob.cs b/src/NexusMods.Library/AddLibraryFileJob.cs
index 2ffe5b9bf..fec9022a6 100644
--- a/src/NexusMods.Library/AddLibraryFileJob.cs
+++ b/src/NexusMods.Library/AddLibraryFileJob.cs
@@ -23,7 +23,9 @@ internal class AddLibraryFileJob : IJobDefinitionWithStart<AddLibraryFileJob, Li
 
     private Extension[] NestedArchiveExtensions { get; } =
     [
-        KnownExtensions._7z, KnownExtensions.Rar, KnownExtensions.Zip, KnownExtensions._7zip
+        KnownExtensions._7z, KnownExtensions.Rar, KnownExtensions.Zip, KnownExtensions._7zip,
+        // Stardew Valley SMAPI nested archive
+        new(".dat"),
     ];
 
     public static IJobTask<AddLibraryFileJob, LibraryFile.New> Create(IServiceProvider provider, ITransaction transaction, AbsolutePath filePath, bool doCommit, bool doBackup)