Check if data store folder is a directory on Windows works

lib/vagrant/data_store.rb

@@ -19,13 +19,12 @@ module Vagrant
       @file_path = file_path
       return if !file_path
 
+      raise Errors::DotfileIsDirectory if File.directory?(file_path)
       File.open(file_path, "r") do |f|
         merge!(JSON.parse(f.read))
       end
     rescue Errno::ENOENT
       clear
-    rescue Errno::EISDIR
-      raise Errors::DotfileIsDirectory
     end
 
     # Commits any changes to the data to disk. Even if the data