I'm working in Geogebra 4.0 and I was working in a file and parallel to it I wanted to open another existing file for comparison and as I double clicked on the already saved file it opened up, but the file I hadn't saved and the one I was working in vanished. I'm wondering whether there is any way to recover/find this file that I haven't saved yet... How is it possible that the file that I opened "replaced" the one I was working in? I don't quite understand... I had about 1.5 hours of work in the file that I lost. Any suggestions? Why would this have happened? Thanks for your help!