More specifically it seems that Windows 7 is constantly sending WM_UPDATE messages to check if our program is alive. We figured out that the process dialog must handle messages to avoid this. Starting with Windows 7 we realized that Windows quite soon shows a message " seems to hang." and/or appends "Not responding" to our window title bar. During long term operations our C++ Win32 application shows a modal status dialog with a process bar, which is updated irregular every few seconds or so.
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