diff --git a/BaseTools/Source/Python/BPDG/GenVpd.py b/BaseTools/Source/Python/BPDG/GenVpd.py
index b91837d3d6..71fcfc5ac3 100644
--- a/BaseTools/Source/Python/BPDG/GenVpd.py
+++ b/BaseTools/Source/Python/BPDG/GenVpd.py
@@ -651,7 +651,7 @@ class GenVPD :
             EdkLogger.error("BPDG", BuildToolError.FILE_OPEN_FAILURE, "File open failed for %s" % self.VpdFileName, None)
 
         try :
-            fMapFile = open(MapFileName, "w", 0)
+            fMapFile = open(MapFileName, "w")
         except:
             # Open failed
             EdkLogger.error("BPDG", BuildToolError.FILE_OPEN_FAILURE, "File open failed for %s" % self.MapFileName, None)
@@ -675,8 +675,12 @@ class GenVPD :
             # Write Vpd binary file
             fStringIO.seek (eachPcd.PcdBinOffset)
             if isinstance(eachPcd.PcdValue, list):
-                ValueList = [chr(Item) for Item in eachPcd.PcdValue]
-                fStringIO.write(''.join(ValueList))
+                for i in range(len(eachPcd.PcdValue)):
+                    Value = eachPcd.PcdValue[i:i + 1]
+                    if isinstance(bytes(Value), str):
+                        fStringIO.write(chr(Value[0]))
+                    else:
+                        fStringIO.write(bytes(Value))
             else:
                 fStringIO.write (eachPcd.PcdValue)