[Bug 49747] New: ICO_ExtractIconExW causes crash on incomplete windows executable

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49747

            Bug ID: 49747
           Summary: ICO_ExtractIconExW causes crash on incomplete windows
                    executable
           Product: Wine
           Version: 5.0
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: wine-bugs at winehq.org
          Reporter: andi at notmuch.email
      Distribution: ---

Created attachment 68049
  --> https://bugs.winehq.org/attachment.cgi?id=68049
backtrace of explorer.exe crashing

I have 31% of a binary in a local directory because some installer/patcher
crashed during installation. Whenever I use `winefile` or `wine explorer.exe`
and scroll to that file in the directory wine crashes with the attached
backtrace.

It appears to be related to the ICO handling code within wine that expects more
input but that doesn't exist yet.

Attached is the backtrace of running the patcher for the "Dark Age of Camelot"
freeshard "Phoenix" (https://playphoenix.online) which did cause this issue for
me.

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