Just to help you to specify your problem: I have sometimes the following situation (I think it happens for me primarily with pdf-files but may be with other files too): 1. I open a pdf-file in the browser (with both the browser and the pdf-viewer in Sandboxie). 2. I decide to download the file on my desktop (using quick recovery). 3. I continue to use the browser and when closing it I see the file once more in the following window of Sandboxie: I also wondered about this, but I got accustomed to it. I simply click on "Delete Sandbox" (= "Sandbox leeren") in the window (as I have the file already on my desktop, as consequence of step 2). I assume this is the scenario you mean.