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Assets/Scripts/Editor/SetReadWrite.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using UnityEditor;
+using UnityEngine;
+
+public class SetReadWrite : Editor
+{
+    [MenuItem("Assets/FBX ReadWrite Enable %&r")]
+    public static void EnableFBXReadWrite()
+    {
+        Object[] selectedObjects = Selection.GetFiltered<Object>(SelectionMode.DeepAssets);
+        foreach (Object obj in selectedObjects)
+        {
+            if (obj != null)
+            {
+                string path = AssetDatabase.GetAssetPath(obj);
+                if (Directory.Exists(path))
+                {
+                    EnableFBXReadWriteInFolder(path);
+                }
+                else if (path.EndsWith(".fbx", System.StringComparison.OrdinalIgnoreCase))
+                {
+                    EnableFBXReadWriteForFile(path);
+                }
+            }
+        }
+    }
+
+    public static void EnableFBXReadWriteInFolder(string folderPath)
+    {
+        string[] files = Directory.GetFiles(folderPath, "*.fbx", SearchOption.AllDirectories);
+        foreach (string file in files)
+        {
+            EnableFBXReadWriteForFile(file);
+        }
+    }
+
+    public static void EnableFBXReadWriteForFile(string filePath)
+    {
+        string relativePath = filePath;
+        ModelImporter importer = AssetImporter.GetAtPath(relativePath) as ModelImporter;
+        if (importer != null)
+        {
+            importer.isReadable = true;
+            AssetDatabase.ImportAsset(relativePath, ImportAssetOptions.ForceUpdate);
+            Debug.Log("Enabled Read/Write for: " + relativePath);
+        }
+    }
+}