diff --git a/pym/cl_utils.py b/pym/cl_utils.py
index 658b74c..fb5582f 100644
--- a/pym/cl_utils.py
+++ b/pym/cl_utils.py
@@ -121,7 +121,18 @@ class typeFile:
 
     def getMType(self, filename):
         """Информация о типе файла"""
-        return self.magicObject.file(filename)
+        ret = self.magicObject.file(filename)
+        # fix for kernel 3.7.7 (bad work samba with big files)
+        if ret is None and self.magicObject.errno() == 5:
+            r,w = os.pipe()
+            devnull = os.open(os.devnull,os.O_WRONLY)
+            cat = subprocess.Popen(['/bin/cat',filename],stdout=w,
+                                    stderr=devnull,close_fds=True)
+            ret = self.magicObject.descriptor(r)
+            os.close(w)
+            os.close(devnull)
+            cat.wait()
+        return ret
 
     def isBinary(self, filename):
         """является ли файл бинарным"""