title: Batch multiple choose menu
body: <p>I made a menu in batch that display all the <em>.txt</em> file in folder and assign each file a number. Based on this tutorial: 
  <a href="https://stackoverflow.com/questions/8913107/batch-script-programming-how-to-allow-a-user-to-select-a-file-by-number-from">Batch Script Programming -- How to allow a user to select a file by number from a list of files in a folder?</a>
  - It works very well, but I want to make it possible to choose more then 1 file. Example, the user can choose for example <em>1,2,4</em> and in a new variable I will get all the files names of the first file that was listed, the second, and the fourth.</p>
  
  <p>In addition the number of <em>.txt</em> file is getting changed so I don't know how many <em>.txt</em> files will be in the folder and I want to let the user choose as many as file he wants- 1 file or more. I need the files in 1 variable because I want after the user choose to use a 3rd part app that need all files names in 1 line so I want to write something like:</p>
  
  <pre><code>"Do this command with %all_files_from_batch_menu%"
  </code></pre>
  
  <p>I hope it was clear...
  Thanks!</p>
  
  <p>Here is an example
  Lets say I have in the folder 5 files <em>a.txt b.txt c.txt d.txt e.txt</em> - I want the menu to show them and assign numbers to each file and if the user will choose <em>1,2,4</em> it will write him you choose <em>a.txt b.txt e.txt</em></p>