Fix model tool importing to use temp file only for Assimp

Source/Engine/Utilities/AnsiPathTempFile.h

@@ -0,0 +1,37 @@
+// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Types/String.h"
+#include "Engine/Platform/FileSystem.h"
+
+// Small utility that uses temporary file to properly handle non-ANSI paths for 3rd party libs.
+struct AnsiPathTempFile
+{
+    StringAnsi Path;
+    String TempPath;
+    bool Temp;
+
+    AnsiPathTempFile(const String& path)
+    {
+        if (path.IsANSI() == false)
+        {
+            // Use temporary file
+            FileSystem::GetTempFilePath(TempPath);
+            if (TempPath.IsANSI() && !FileSystem::CopyFile(TempPath, path))
+            {
+                Path = TempPath.ToStringAnsi();
+                return;
+            }
+            TempPath.Clear();
+        }
+        Path = path.ToStringAnsi();
+    }
+
+    ~AnsiPathTempFile()
+    {
+        // Cleanup temporary file after use
+        if (TempPath.HasChars())
+            FileSystem::DeleteFile(TempPath);
+    }
+};