I'm sure this window can open!

Thanks for posting. I am afraid we don't carry hardware for these type of windows, or to replace telescoping rods like this. A local hardware store may have a better solution. I'm sorry we can't do more, and good luck with the repair. 

Thanks for clarifying, apologies. I'm not certain myself, but I'm running this discussion by one of my senior colleagues who would know for sure, and we'll get back to you as soon as we can with more information. Thanks. 

Perhaps I can help. You are correct, you should be able to just push that bar outward to open the window. In you photo, I can see that the push bar goes through the bottom sill cover and is most likely attached to the window sash. I do believe it is painted shut. It could have paint on both inside and the outside of that wood sash. I would take a chisel, a 5 in 1 tool or a small scrape bar and wedge it between the sash and the interior wood trim. Take your time so not to damage the wood or sash. Also wear safety glass to protect you from any flying paint chips. You might need to use a Hammer to help drive the chisel between wood and sash. Take care that once the window is open you might have trouble trying to pull it closed. Can you get to the outside of the window easily if you need to push it closed from the outside of the house. One more thing do you have a screen to stop bugs from coming into the house once the window is opened.