word to html: document conversion using ruby on rails

Hi,

I am trying to convert MS word files into an HTML format. I have used Abiword and OpenOffice (PyDocConverter) for the document conversion. I am able to convert document using both tools. I need some help regarding storage, rendering, and caching.
1. Where should I store the converted page? Right now, I am using /tmp directory of my system. Will it be good idea to store it in the application's public directory?
2. I would like to open HTML document in a new browser tab or window. Right now I am using ActionController API - send_file and render methods to serve this HTML file. However, they do not seem to offer 'open in new tab' option. Is there any option I can serve this in a new tab? My related question : https://www.experts-exchange.com/questions/23826992/html-link-to-a-file-outside-rails-application-directory-using-ActionView.html?cid=239 
3. Assuming that many users will try to access this document, how can I use caching?

I am attaching my code snippet over here. Please suggest me any other issues to consider and/or improvements in this code.

~
GT

def view_html
    @attachment = Attachment.find(params[:id])     
    @filename = @attachment.filename 
    @data = @attachment.data
    ctype = @attachment.content_type
    
      if ctype == 'application/msword'
        File.open(File.join("/", "tmp", "#{@filename}"), "wb") do |file|  
          file.write(@attachment.data)
        end
        #InvokePyDoc launches OpenOffice in background, uses PyDocConverter, kills OpenOffice process 
        `InvokePyDoc.sh /tmp/#{@filename} /tmp/#{@filename}.html;`
        render :file => "/tmp/#{@filename}.html", :layout => false
        # send_file '/tmp/test.html', :type => 'text/html; charset=utf-8', :disposition => 'inline'
      end
    
  end

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