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Editorial Team
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Asked: 2026-05-23T13:01:13+00:00

How exactly CANCEL button works in default installer UI? If i click CANCEL button,

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How exactly CANCEL button works in default installer UI?

If i click CANCEL button, some times i can able to see “do you want cancel setup” dialog box with yes or no options.

But some cases, this popup won’t show up and installation continues.

I am seeing this problem, if i click CANCEL button at the end of first phase only. status message is “Coping new files”.

“Coping new files” is deferred action. How come this message is showing in first phase?

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1 Answer

  1. Editorial Team

    Are you sure it’s actually running the “Copying new files” action, or is it an action after that which doesn’t post any progress updates? If it’s a custom action, be careful that it does one of two things:

    • Never calls MsiProcessMessage (or equivalent)
    • Pays attention to the return codes of MsiProcessMessage and handles cancel appropriately

    If the action never calls MsiProcessMessage, then Windows Installer will handle cancel for the action, but cannot cancel it in the middle of the action. If the action calls MsiProcessMessage (with certain values for eMessageType), then Windows Installer assumes that the action will process the cancel, and the action must return ERROR_INSTALL_USEREXIT or Windows Installer gets confused.

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