diff --git a/RPGMakerDecrypter.MVMZ/ProjectReconstructor.cs b/RPGMakerDecrypter.MVMZ/ProjectReconstructor.cs
index 2cd60bb..8f54e7a 100644
--- a/RPGMakerDecrypter.MVMZ/ProjectReconstructor.cs
+++ b/RPGMakerDecrypter.MVMZ/ProjectReconstructor.cs
@@ -1,4 +1,5 @@
 using System.IO;
+using System.Linq;
 
 namespace RPGMakerDecrypter.MVMZ
 {
@@ -9,6 +10,7 @@ public abstract class ProjectReconstructor
             "audio",
             "css",
             "data",
+            "dataex",
             "effects",
             "fonts",
             "icon",
@@ -34,14 +36,32 @@ public virtual void Reconstruct(string deploymentPath, string outputPath)
                 Directory.CreateDirectory(outputPath);
             }
 
+            // Get all top-level subdirectories and create lowercase-to-original mapping
+            var sourceDirectories = Directory.Exists(deploymentPath)
+                ? Directory.GetDirectories(deploymentPath, "*", SearchOption.TopDirectoryOnly)
+                : new string[0];
+            var sourceDirectoryMap = sourceDirectories.ToDictionary(
+                directoryPath => Path.GetFileName(directoryPath).ToLowerInvariant(),
+                directoryPath => Path.GetFileName(directoryPath));
+
             foreach (var directory in _directories)
             {
-                CopyDirectory(Path.Combine(deploymentPath, directory), Path.Combine(outputPath, directory));
+                // Find actual directory name (case-insensitive)
+                if (sourceDirectoryMap.TryGetValue(directory.ToLowerInvariant(), out var actualDirectoryName))
+                {
+                    CopyDirectory(
+                        Path.Combine(deploymentPath, actualDirectoryName),
+                        Path.Combine(outputPath, actualDirectoryName));
+                }
             }
             
             foreach (var file in _files)
             {
-                File.Copy(Path.Combine(deploymentPath, file), Path.Combine(outputPath, file));
+                var sourceFile = Path.Combine(deploymentPath, file);
+                if (File.Exists(sourceFile))
+                {
+                    File.Copy(sourceFile, Path.Combine(outputPath, file));
+                }
             }
             
             CreateProjectFile(outputPath);
@@ -69,4 +89,4 @@ private void CopyDirectory(string sourceDir, string destinationDir)
             }
         }
     }
-}
\ No newline at end of file
+}