rb file open

i have downloaded your sketchup file which has an RB file-----how do i open this

Forums: 

Using the plugin file

To use the plugin, put the downloaded skp_to_dxf.rb file in the Sketchup plugins folder on your computer.

  • On a Windows PC. If you have installed Sketchup on the C: drive then this folder will be at C:\program files\google\google sketchup 7\plugins. 
  • On Mac OSX. The sketchup plugins folder is /Library/Application Support/Google SketchUp 6/SketchUp/Plugins

After copying this file, start Sketchup and you should now have an extra menu option (Export to DXF or STL) in the Sketchup Tools menu.