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#11
Since Malwarebytes didn't find anything, it is possible that the problem file is not exactly malware, or at least it hasn't been classified as such by Malwarebytes. Since the window in question appears on startup, I would look on the Startup tab of msconfig, as well as in the Startup folder in the Start Menu, not for that particular file, but for anything that you do not recognize as needed or normal, and delete or disable it. Chances are good that it is pointing to that .tmp folder during startup.