Merge pull request #163 from ruby-docx/restore-previous-behaviour

Accepts files whose extension is not .docx or which does not have extension

Author: satoryu

lib/docx/document.rb

@@ -29,7 +29,6 @@ def initialize(path_or_io, options = {})
 
       # if path-or_io is string && does not contain a null byte
       if (path_or_io.instance_of?(String) && !/\u0000/.match?(path_or_io))
-        raise Errno::EIO.new('Invalid file format') if !File.extname(path_or_io).eql?('.docx')
         @zip = Zip::File.open(path_or_io)
       else
         @zip = Zip::File.open_buffer(path_or_io)

spec/docx/document_spec.rb

@@ -20,12 +20,6 @@
     end
 
     context 'When reading a un-supported file' do
-      it 'should throw file not supported error' do
-        expect do
-          Docx::Document.open(@fixtures_path + '/invalid_format.pdf')
-        end.to raise_error(Errno::EIO, 'Input/output error - Invalid file format')
-      end
-
       it 'should throw file not found error' do
         invalid_path = @fixtures_path + '/invalid_file_path.docx'
         expect do