Use a file manager to locate your file again. If you are in windows 3.1, find the file manager icon (a file cabinet) with Program Manager
If you are in Win 95, find windows explorer from the start menu On the Macintosh, you are already in a file manager when the computer is turned on. (wow!)
Once you get into the file manager, look at the floppy disk. You are clever. You don't need the details!
Double click on the icon that represents your painting. There it is!!!
Minimize (don't completely close) your paint program.