A file processing method, an electronic device, a system, and a storage medium are provided. The method includes: A second electronic device projects onto a first electronic device, and generates a collaboration window on the first electronic device; it is detected that a target file in the first electronic device is dragged by a first operation to an icon of a first application in the collaboration window, and the first operation is released, and the first application is used to open the target file in the collaboration window; and it is detected that the target file in the first electronic device is dragged by a second operation to an icon of a second application in the collaboration window, and the second operation is released, and the second application is used to open the target file in the collaboration window.