ClickOnce activated in Chromium Edge - Browser still downloads deployment manifest instead of starting application

Question

We deploy one of our applications as a ClickOnce application. To make this work in the new Chromium based Edge browser we have had to make sure that our users either manually activate ClickOnce using edge://flags or are using a policy to enable ClickOnce in Edge. Both are described here.

This works for most of our users but we have at least one user where this still does not make ClickOnce work. The browser still insists on downloading the deployment manifest (.application) instead of activating the ClickOnce application just as if ClickOnce was not activated.

This is the situation for this user:

• Running Windows 7.
• Have enabled ClickOnce using edge://flags.
• Made sure that the registry flags in the ClickOnce/Edge policy (see link above) is not present at all (neither under "current user" or "local machine").
• Reinstalled Chromium Edge (no difference).

My questions are:

• What else, other than the settings/policy mentioned, can make Edge behave like this?
• Are there logging/debugging facilities in Edge that can be used to troubleshoot a problem like this?

Answer 1

@Johan Pettersson are there any users with Win7 installed that are able to use ClickOnce with Chromium Edge?

Answer 2

I have the same problem in every windows 7 machine using Microsoft Edge. No matter the flag or the registry, the .application file is always downloaded instead of being launched.

Answer 3

Same Problem here. Using Edge 87.0.664.47
Works fine on my developer machine running Windows 10, but on Windows Server 2008 R2 Edge downloads the .application file and launches it from the download folder.
But I don't think it is related to the os.
Searching for differences in the edge settings I found some group policies from our company.

AutoOpenAllowedForURLs = "some.company.domain.names"
AutoOpenFileTypes = "ica" // .ica files for Citrix

On my Win10 machine these setings are emtpy.
Maybe it helps to add "application" to the FileTypes list.

Answer 4

Having a similar problem now with Windows10 PCs and Chromium Edge, where Edge intercepts the setup.exe (despite ClickOnce being enabled in GroupPolicy) and then {app-name}.application cannot be found in the user's Downloads folder. Do we have to turn off SmartScreen in order to use Edge with ClickOnce? Is there documentation on how to configure Edge settings to allow for ClickOnce deployment of Winforms programs from a UNC share where the installer is launched by the publish.htm page that Visual Studio creates?