[Crash]: If the directory name contains multibyte characters, openTTD will crash.

[koutya0125]

Version of OpenTTD

14.1,windows11

Steps to reproduce

1.Install openTTD in the multibyte character folder.
2.Start openTTD.

In countries that use multibyte characters (e.g., Japan), user folders and documents folders may be in multibyte characters.
Basically, even if a documents folder looks like it is in multibyte characters, the actual path is often in single-byte characters.
However, if the documents folder is in OneDrive, the actual path is also likely to be multibyte characters.
If only the documents folder is multibyte characters, it will crash when trying to download newGRF.

Upload crash files

crash20240509071908.zip

[glx22]

 	openttd.exe!google_breakpad::ExceptionHandler::WriteMinidump(const std::wstring & dump_path, bool(*)(const wchar_t *, const wchar_t *, void *, _EXCEPTION_POINTERS *, MDRawAssertionInfo *, bool) callback, void * callback_context, _MINIDUMP_TYPE dump_type) Ligne 773	C++
 	openttd.exe!CrashLogWindows::WriteCrashDump() Ligne 113	C++
 	[Cadre en ligne] openttd.exe!std::_Func_class<bool>::operator()() Ligne 854	C++
 	openttd.exe!CrashLogWindows::TryExecute(std::basic_string_view<char,std::char_traits<char>> section_name, std::function<bool __cdecl(void)> && func) Ligne 124	C++
 	openttd.exe!CrashLog::MakeCrashLog() Ligne 294	C++
 	openttd.exe!ExceptionHandler(_EXCEPTION_POINTERS * ep) Ligne 341	C++
 	[Code externe]	
 	[Cadre en ligne] openttd.exe!std::filesystem::path::{ctor}(const std::string &) Ligne 655	C++
>	openttd.exe!TarScanner::AddFile(const std::string & filename, unsigned __int64 __formal, const std::string & tar_filename) Ligne 534	C++
 	openttd.exe!ScanPath(FileScanner * fs, const char * extension, const char * path, unsigned __int64 basepath_length, bool recursive) Ligne 1189	C++
 	openttd.exe!FileScanner::Scan(const char * extension, Subdirectory sd, bool tars, bool recursive) Ligne 1234	C++
 	openttd.exe!TarScanner::DoScan(Subdirectory sd) Ligne 433	C++
 	openttd.exe!TarScanner::DoScan(TarScanner::Mode mode) Ligne 443	C++
 	openttd.exe!openttd_main(int argc, char * * argv) Ligne 683	C++
 	openttd.exe!WinMain(HINSTANCE__ * __formal, HINSTANCE__ * __formal, char * __formal, int __formal) Ligne 85	C++
 	[Code externe]	

[glx22]

Test build with a possible fix here