index 79e2d13..1261a36 100644
--- a/lib/redmine/scm/adapters/mercurial_adapter.rb
+++ b/lib/redmine/scm/adapters/mercurial_adapter.rb
@@ -16,6 +16,8 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require 'redmine/scm/adapters/abstract_adapter'
+require 'rbconfig'
+include Config
 
 module Redmine
   module Scm
@@ -23,7 +25,12 @@ module Redmine
       class MercurialAdapter < AbstractAdapter
         
         # Mercurial executable name
-        HG_BIN = "hg"
+        if CONFIG['host_os'] =~ /mswin|windows/i then
+          HG_BIN = "hg.exe"
+        else
+          HG_BIN = "hg"
+        end
+        
         TEMPLATES_DIR = File.dirname(__FILE__) + "/mercurial"
         TEMPLATE_NAME = "hg-template"
         TEMPLATE_EXTENSION = "tmpl"