An hour ago I installed the last version of this software, then I opened my project and added some files with extension "*.h" I opened them as "C Files", then when trying to close them one of them closed, but I cannot close the others (I opened three of them). I already re-started my computer but I just can't get these files off my project. I right click the mouse over the file select "remove filename.h" and asks If I am sure I want to remove it when I select yes, it does nothing!.