diff --git a/middleman-core/lib/middleman-core/sitemap/resource.rb b/middleman-core/lib/middleman-core/sitemap/resource.rb
index 6c14fca5..fc98ed15 100644
--- a/middleman-core/lib/middleman-core/sitemap/resource.rb
+++ b/middleman-core/lib/middleman-core/sitemap/resource.rb
@@ -1,5 +1,7 @@
 require "middleman-core/sitemap/extensions/traversal"
 
+require 'win32/file' if File::ALT_SEPARATOR
+
 module Middleman
 
   # Sitemap namespace
diff --git a/middleman-core/lib/middleman-core/version.rb b/middleman-core/lib/middleman-core/version.rb
index 671ddead..e7edf617 100644
--- a/middleman-core/lib/middleman-core/version.rb
+++ b/middleman-core/lib/middleman-core/version.rb
@@ -1,5 +1,5 @@
 module Middleman
   # Current Version
   # @return [String]
-  VERSION = '3.0.9' unless const_defined?(:VERSION)
+  VERSION = '3.0.10.pre.1' unless const_defined?(:VERSION)
 end
diff --git a/middleman-core/middleman-core-x86-mingw32.gemspec b/middleman-core/middleman-core-x86-mingw32.gemspec
index d1779828..b78eed14 100644
--- a/middleman-core/middleman-core-x86-mingw32.gemspec
+++ b/middleman-core/middleman-core-x86-mingw32.gemspec
@@ -35,4 +35,7 @@ Gem::Specification.new do |s|
   # Watcher
   s.add_dependency("listen", ["~> 0.5.2"])
   s.add_dependency("wdm", ["~> 0.0.3"]) # Windows
+
+  # Detect binary
+  s.add_dependency('win32-file', '>= 0.5.4')
 end