[Bug 51821] New: EVE Online Sisi Client Crashes Due to differences in how Wine and Windows handle LoadLibraryExW Undefined Behavior

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51821

            Bug ID: 51821
           Summary: EVE Online Sisi Client Crashes Due to differences in
                    how Wine and Windows handle LoadLibraryExW Undefined
                    Behavior
           Product: Wine
           Version: 6.16
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: algebro at tuta.io
      Distribution: ---

I've been chasing this for the last few days and think I may finally have
enough information to finally open a bug report. As of a few days ago, the Sisi
testing client for EVE stopped working in recent versions of Wine, and the logs
showed an unhandled Python error in a module called launchdarkly_client.pyd:

```ImportError: Failed to load DLL: Success```

I chased this down in a debugger and noticed they're passing a relative path to
LoadLibraryExW for this library only (full/absolute paths for every other
module), and 8 for dwFlags:

```hLibModule = LoadLibraryExW((LPCWSTR)plVar4[3],(HANDLE)0x0,8)```

Per the Microsoft documentation, 8 for dwFlags is undefined when the first
argument is a relative path:
https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-loadlibraryexw

Weirdly enough, the library loads fine on Windows (I've confirmed in windbg),
but it fails with error code 0x7e (Module not found) when trying to load it in
wine. Other users running Wine 4.4 say Sisi launches fine and doesn't run into
the error, although I havent been able to get older versions to build to try
and test it, but it sounds like there is a difference between how recent Wine
versions implement LoadLibraryExW() and how Windows does, at least with regards
to the undefined behavior.

Let me know if I can provide any other information that would be helpful for
tracking this down.

Thanks!

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