If you have Norton and a protected trash you can probably rescue the previous save. I went in and found two copies with my same working name. I rescued these as file001 and file002,renaming them so they would not write over each other. The first one wouldn't open in Bryce. The second one was the previous day's work without my latest changes, but at least I got that much back. Remember that the longer you surf, or the more programs you install or save the bigger the chance that you will write over the file before you can rescue it. All I can say is save early and often. If you have comitted major time you might consider saving a file001, file002, etc so you only have to recreate a day's work if it crashes. Windows also does not see Bryce as a running task. I saved a Bryce file and exited. Unlike microsoft office where it asks you to save your open files, or other apps where a window pops up and asks you to wait to give the program time to quit, Windows will shut down with the drive still running. If you move your mouse to the top of the screen after saving the Bryce top bar will not pop back up until the save is complete. If you quit Bryce and press the save file button watch the drive light on your PC. Don't quit Windows until the light goes off.