diff --git a/Tools/ModelTranslator/rizom_unwrap.py b/Tools/ModelTranslator/rizom_unwrap.py
new file mode 100644
index 00000000..48718dd7
--- /dev/null
+++ b/Tools/ModelTranslator/rizom_unwrap.py
@@ -0,0 +1,50 @@
+"""RizomUV 自动展开：官方 RizomUVLink 驱动 rizomuv.exe 做 AutoSeam/Unfold/Pack。
+仅在系统 Python 中使用（不进 Blender）；任何不可用/失败抛 RizomError，
+由 model_decimate.py 回退 Blender seam 展开。"""
+import os
+import sys
+import threading
+
+DEFAULT_RIZOM = r"C:\Program Files\RizomUV2025\rizomuv.exe"
+MAP_RES = 2048        # Pack 目标贴图分辨率
+PADDING_PX = 4        # 岛间距（像素）＝ bl_decimate.PACK_MARGIN(0.002) * 2048
+TIMEOUT_S = 300       # 单条命令超时
+
+
+class RizomError(Exception):
+    """RizomUV 不可用或处理失败（上层据此回退）。"""
+
+
+def candidate_paths(cli_arg=None, env_val=None, reg_val=None, default=DEFAULT_RIZOM):
+    """rizomuv.exe 候选路径，优先级：CLI 参数 > 环境变量 > 注册表 > 默认安装位置。"""
+    return [p for p in (cli_arg, env_val, reg_val, default) if p]
+
+
+def registry_rizom_path():
+    """官方 README 的注册表查找（HKLM\\SOFTWARE\\Rizom Lab\\RizomUV VS RS 202X.Y），
+    新版本优先；找不到或非 Windows 返回 None。"""
+    try:
+        import winreg
+    except ImportError:
+        return None
+    for i in range(9, 1, -1):
+        for j in range(10, -1, -1):
+            if i == 2 and j < 2:
+                continue
+            key_path = "SOFTWARE\\Rizom Lab\\RizomUV VS RS 202%d.%d" % (i, j)
+            try:
+                key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, key_path)
+                return winreg.QueryValue(key, "rizomuv.exe")
+            except OSError:
+                continue
+    return None
+
+
+def find_rizomuv(cli_arg=None, use_registry=True, default=DEFAULT_RIZOM):
+    """返回第一个真实存在的 rizomuv.exe；都不存在抛 RizomError。"""
+    reg = registry_rizom_path() if use_registry else None
+    cands = candidate_paths(cli_arg, os.environ.get("RIZOMUV_EXE"), reg, default)
+    for p in cands:
+        if os.path.isfile(p):
+            return p
+    raise RizomError("找不到 rizomuv.exe（尝试过：%s）" % "; ".join(cands))
diff --git a/Tools/ModelTranslator/tests/test_rizom_unwrap.py b/Tools/ModelTranslator/tests/test_rizom_unwrap.py
new file mode 100644
index 00000000..aa74dc89
--- /dev/null
+++ b/Tools/ModelTranslator/tests/test_rizom_unwrap.py
@@ -0,0 +1,31 @@
+import os
+import sys
+import unittest
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+import rizom_unwrap as ru
+
+
+class TestCandidatePaths(unittest.TestCase):
+    def test_priority_order(self):
+        self.assertEqual(ru.candidate_paths("a.exe", "b.exe", "c.exe"),
+                         ["a.exe", "b.exe", "c.exe", ru.DEFAULT_RIZOM])
+
+    def test_none_entries_skipped(self):
+        self.assertEqual(ru.candidate_paths(None, None, None), [ru.DEFAULT_RIZOM])
+
+    def test_env_only(self):
+        self.assertEqual(ru.candidate_paths(None, "b.exe", None),
+                         ["b.exe", ru.DEFAULT_RIZOM])
+
+
+class TestFindRizomuv(unittest.TestCase):
+    def test_missing_exe_raises(self):
+        os.environ.pop("RIZOMUV_EXE", None)
+        with self.assertRaises(ru.RizomError):
+            ru.find_rizomuv("Z:/no/such/rizomuv.exe", use_registry=False,
+                            default="Z:/no/default.exe")
+
+
+if __name__ == "__main__":
+    unittest.main()