Dude to avoid being cut by the glass on the window , instead of Right-Clicking on the window and selecting "break" , you could just Attack the window (So it will break) like attacking zombies. So , it will break the window and you will not cut yourself (You need to have A Weapon equiped) To safely Climb The Window without being cut by glass shards , after you break the window , Right click on the Window and Select "Remove Glass". If there is no option like the remove glass , then its safe to climb. (Sorry for the bad english , i'm from brazil :/)