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Asked: 2026-05-12T18:29:53+00:00

Inno Setup fails to remove components during uninstall cause my program is still running

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Inno Setup fails to remove components during uninstall cause my program is still running and the executable cannot be deleted. How do I have it check to see if it is running before allowing uninstall to proceed?

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  1. Editorial Team

    Check these

    Inno Setup: Detect instances running in any user session with AppMutex

    Inno Setup: Is application running?

    Inno Setup: Detect if an application is running

    There are several ways. If your program defines a mutex use

    [Setup]
AppMutex=MyMutexName

    or for a specified mutex in the Code section

    function CheckForMutexes (Mutexes: String): Boolean;

    You could also use

    function FindWindowByClassName (const ClassName: String): Longint;

    to get the window handle by class name and send it messages.

    Or get it by the name

    function FindWindowByWindowName (const WindowName: String): Longint;

    Or you use one of several DLL files for this specific use case

    Or do it yourself after reading

    How To Terminate an Application “Cleanly” in Win32

    How To Enumerate Applications Using Win32 APIs (this one links to the german version as for some reason I can’t find the english version of KB175030

    or try the google translated version of the KB175030-DE

    KB175030 DE -> EN

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