New subject: [Bug 59262] Many Microsoft Store installers fail to start with System.NullReferenceException

16 Jan 2026

      http://bugs.winehq.org/show_bug.cgi?id=59262

            Bug ID: 59262
           Summary: Many Microsoft Store installers fail to start with
                    System.NullReferenceException
           Product: Wine
           Version: 11.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: mscoree
          Assignee: wine-bugs@list.winehq.org
          Reporter: lingm+winebz@posteo.org
      Distribution: ---

Created attachment 80185
  --> http://bugs.winehq.org/attachment.cgi?id=80185
System.NullReferenceException error

Follow up to bug 58905.

Happens with:
Tiktok https://apps.microsoft.com/detail/9nh2gph4jzs4
Netflix https://apps.microsoft.com/detail/9wzdncrfj3tj
Prime Video https://apps.microsoft.com/detail/9p6rc76msmmj
Whatsapp https://apps.microsoft.com/detail/9nksqgp7f2nh

and likely many more. You'll need to switch the user agent to pretend to be on
Windows to be shown the download button labeled "Install". Otherwise the Store
only shows a "Copy link" button.

The error can be worked around with `winetricks dotnet48`, although the next
crash due to missing Windows.Globalization.GeographicRegion (bug 58907) follows
quickly.

No window even appears.

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[Bug 59262] New: Many Microsoft Store installers fail to start with System.NullReferenceException

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