Replace '\' with '/' on synced folders on Windows

CHANGELOG.md

@@ -63,6 +63,8 @@ BUG FIXES:
   - With forward agent enabled and sudo being used, Vagrant will automatically
     discover and set `SSH_AUTH_SOCK` remotely so that forward agent
     works properly despite misconfigured sudoers. [GH-1307]
+  - Synced folder paths on Windows containing '\' are replaced with
+    '/' internally so that they work properly.
 
 ## 1.2.4 (July 16, 2013)
 

plugins/kernel_v2/config/vm.rb

@@ -125,6 +125,12 @@ module VagrantPlugins
       #   folder.
       # @param [Hash] options Additional options.
       def synced_folder(hostpath, guestpath, options=nil)
+        if Vagrant::Util::Platform.windows?
+          # On Windows, Ruby just uses normal '/' for path seps, so
+          # just replace normal Windows style seps with Unix ones.
+          hostpath.gsub!("\\", "/")
+        end
+
         options ||= {}
         options[:guestpath] = guestpath.to_s.gsub(/\/$/, '')
         options[:hostpath]  = hostpath