[Mozilla Enterprise] Can't open links in Outlook - caused by registry keys, fix?

[Martin Feuerstein]

Hi Andre,

this might be caused by the "User Choice" registry entries - especially when switching from x86 to x64.

HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\https\UserChoice

When you delete these keys Windows will ask for the default browser next time a link is opened.

PS: It is possible to set the default browser with this tool in a login script: https://danysys.com/set-file-type-association-default-application-command-line-windows-10-userchoice-hash-internal-method/. This will also calculate the necessary hash value.

Kind Regards / Viele Grüße, Martin Feuerstein
Bitte denken Sie über Ihre Verantwortung gegenüber der Umwelt nach, bevor Sie diese E-Mail ausdrucken.

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Betreff: Enterprise Digest, Vol 110, Issue 3

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Today's Topics:

   1.  Can?t open links in Outlook - caused by stale FirefoxESR
      registry keys, fix? (Andr? S?nger)


----------------------------------------------------------------------

Message: 1
Date: Wed, 5 Aug 2020 11:40:54 +0200
From: Andr? S?nger <andre.saenger at landkreis-coburg.de>
To: "enterprise at mozilla.org" <enterprise at mozilla.org>
Subject: [Mozilla Enterprise] Can?t open links in Outlook - caused by
	stale FirefoxESR registry keys, fix?
Message-ID: <414a49bd-cad4-4d24-c8f4-6e381411b959 at landkreis-coburg.de>
Content-Type: text/plain; charset="windows-1252"; format=flowed

Hello,

some of our Users (Windows 10) reported errors when trying to open links in Outlook messages (?Your organization?s policies are preventing us from completing this action for you. For more info, please contact your help desk?.). I have tracked down the problem to incorrect FirefoxESR Registry keys.

In these cases I noticed [HKEY_CLASSES_ROOT\.html] still points to @="FirefoxHTML", which in turn contains no HKR\FirefoxHTML\shell\open\command.

HKR\FirefoxHTML-E7CF176E110C11B does exist as well and contains correct shell\open\command entries but doesn?t get used since HKR\.html still points to HKR\FirefoxHTML.

Already tried reinstalling firefox, changing the standard app selection via Windows 10 system settings, executing [Firefoxpath]\uninstall\helper.exe" /SetAsDefaultAppGlobal command, all without success.

As a quick workaround copying the shell\open\command from the FirefoxHTML-E7CF176E110C11B entry to the FirefoxHTML one does work, but that?s not a proper fix.

Is there a tool/script, that can clean up the old stale FirefoxHTML / FirefoxURL entries automatically? It?s not just [HKEY_CLASSES_ROOT\.html], there are lots of entries all over the place still pointing to the old nomenclature.


--
Regards,
Andr?




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