diff --git a/Tools/ModelTranslator/unity_assets.py b/Tools/ModelTranslator/unity_assets.py
index a35d1927..93e006e7 100644
--- a/Tools/ModelTranslator/unity_assets.py
+++ b/Tools/ModelTranslator/unity_assets.py
@@ -1,4 +1,7 @@
-"""Unity 资产（.meta / .mat）文本模板与 GUID 管理。纯 stdlib，可独立测试。"""
+"""Unity 资产（.meta / .mat）文本模板与 GUID 管理。纯 stdlib，可独立测试。
+
+模板采自 Unity 2022.3（TextureImporter serializedVersion 12 / Material 8 /
+ModelImporter 22200）；升级 Unity 后如导入异常，在编辑器导出同类资产 diff 更新模板。"""
 import os
 import re
 import uuid
@@ -16,8 +19,11 @@ def guid_for(asset_path):
     """资产已有 .meta 则复用其中 guid（重复转换不破坏 Unity 引用），否则新分配。"""
     meta = asset_path + ".meta"
     if os.path.isfile(meta):
-        with open(meta, "r", encoding="utf-8") as f:
-            m = _GUID_RE.search(f.read())
+        try:
+            with open(meta, "r", encoding="utf-8", errors="replace") as f:
+                m = _GUID_RE.search(f.read())
+        except OSError:
+            m = None  # meta 损坏/不可读时按无 meta 处理，重新分配
         if m:
             return m.group(1)
     return new_guid()