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Editorial Team
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Asked: 2026-05-23T23:07:22+00:00

In my installer, I have an asynchronous dll custom action that executes before the

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In my installer, I have an asynchronous dll custom action that executes before the welcome screen appears and gathers some necessary information for the installer to work. Before I had it set as synchronous, but what happens is there is no welcome screen for about 15 seconds or more (depending on computer). So I changed it to asynchronous which allows the welcome screen to appear, which is what I want.

But now I want the Next button to be invalid until the CA returns ERROR_SUCCESS.

Can I do this by editing the MSI with Orca? That would be my preference. Otherwise, can I do this from within another custom action?

Thanks!

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1 Answer

  1. Editorial Team

    You can schedule a modeless dialog to appear while your custom action runs. For example, in WiX, the PrepareDlg is shown while the AppSearch standard action processes machine searches.

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