OCRA site has this warning... Maybe this could help.

//If you use .rbw files or the --windows option, then check that your
application works with rubyw.exe before trying with OCRA//

Siddharth

On Thu, Jul 12, 2012 at 6:29 AM, Karan J. <lists / ruby-forum.com> wrote:
> Yes, I am. I am even able to run exe on my m/c which has ruby. The issue
> comes when I try running on a m/c w/o ruby..
>
> Thanks
>
> --
> Posted via http://www.ruby-forum.com/.
>