|  1 |    initial version    |  
Yeah; I have an environment variable path set to C:\Program Files\OpenStudio 1.10.0\ruby-install\ruby\bin, and can require 'openstudio' from within irb to access the SDK. 
    |  2 |    No.2 Revision    |  
Yeah; I have an environment variable path set to C:\Program Files\OpenStudio 1.10.0\ruby-install\ruby\bin, and can require 'openstudio' from within irb to access the SDK. 
...I think there are additional steps if you're not using the ruby that's shipped with OS.
    |  3 |    No.3 Revision    |  
Yeah; I have an environment variable path set to C:\Program Files\OpenStudio 1.10.0\ruby-install\ruby\bin, and can require 'openstudio' from within irb to access the SDK. 
...I think there are additional steps if you're not using the ruby that's shipped with OS.OS. See the 'Optional - Install Ruby' subsection of 'Installation Steps' on this page.