diff --git a/scapy/arch/windows/__init__.py b/scapy/arch/windows/__init__.py
index c6b345a01991b89b58d0dd94f5250e9dfcbda8ad..5968fc2f76f0a30c8777ed7e2bf44009ceae0ea7 100755
--- a/scapy/arch/windows/__init__.py
+++ b/scapy/arch/windows/__init__.py
@@ -6,11 +6,13 @@
 """
 Customizations needed to support Microsoft Windows.
 """
+
 import os,re,sys,socket,time, itertools
 import subprocess as sp
 from glob import glob
 import tempfile
 
+#import scapy.data
 from scapy.config import conf, ConfClass
 from scapy.error import Scapy_Exception, log_loading, log_runtime, warning
 from scapy.utils import atol, itom, inet_aton, inet_ntoa, PcapReader
@@ -259,6 +261,9 @@ class WinProgPath(ConfClass):
         )
         self.cscript = win_find_exe("cscript", installsubdir="System32",
                                env="SystemRoot")
+        if self.wireshark != "wireshark":
+            manu_path = load_manuf(os.path.sep.join(self.wireshark.split(os.path.sep)[:-1])+os.path.sep+"manuf")
+            scapy.data.MANUFDB = conf.manufdb = MANUFDB = manu_path
 
 conf.prog = WinProgPath()
 if conf.prog.powershell == "powershell":
diff --git a/scapy/data.py b/scapy/data.py
index 5a46311957afe11df02e8d0d090308766e32c0dd..14cb15e3847b0c8c5ce58c434c6795c1755bc30f 100644
--- a/scapy/data.py
+++ b/scapy/data.py
@@ -147,7 +147,8 @@ class ManufDA(DADict):
         if oui in self:
             return ":".join([self[oui][0]]+ mac.split(":")[3:])
         return mac
-        
+    def __repr__(self):
+        return "\n".join(["<%s %s, %s>" % (i[0], i[1][0], i[1][1]) for i in self.__dict__.items()])
         
         
 
@@ -165,12 +166,12 @@ def load_manuf(filename):
                     lng=shrt
                 else:
                     lng = l[i+2:]
-                manufdb[oui] = shrt,lng
+                manufdb[oui] = shrt, lng
             except Exception,e:
                 log_loading.warning("Couldn't parse one line from [%s] [%r] (%s)" % (filename, l, e))
     except IOError:
         #log_loading.warning("Couldn't open [%s] file" % filename)
-        pass
+        return ""
     return manufdb
     
 
@@ -179,6 +180,7 @@ if WINDOWS:
     ETHER_TYPES=load_ethertypes("ethertypes")
     IP_PROTOS=load_protocols(os.environ["SystemRoot"]+"\system32\drivers\etc\protocol")
     TCP_SERVICES,UDP_SERVICES=load_services(os.environ["SystemRoot"] + "\system32\drivers\etc\services")
+    # Default value, will be updated by arch.windows
     MANUFDB = load_manuf(os.environ["ProgramFiles"] + "\\wireshark\\manuf")
 else:
     IP_PROTOS=load_protocols("/etc/protocols")
diff --git a/test/regression.uts b/test/regression.uts
index bd13bbefe2dedc8940d2c4a31081785df9b32697..f8bf0b1767ef062f7aab07bb0193db2d6537b5c4 100644
--- a/test/regression.uts
+++ b/test/regression.uts
@@ -650,6 +650,17 @@ send_and_sniff(IP(dst="secdev.org")/ICMP())
 send_and_sniff(IP(dst="secdev.org")/ICMP(), flt="icmp")
 send_and_sniff(Ether()/IP(dst="secdev.org")/ICMP())
 
+############
+############
++ ManuFDB tests
+
+= __repr__
+
+conf.manufdb
+
+= check _resolve_MAC
+
+assert conf.manufdb._resolve_MAC("00:00:63") == "HP"
 
 ############
 ############