Godot

• https://docs.godotengine.org/ja/stable/index.html

ネイティブのファイルダイアログを使う

• https://godotengine.org/asset-library/asset/1344
  • 使い方: https://github.com/98teg/NativeDialogs

C++で書きたい

GDExtensionを使う

• https://docs.godotengine.org/en/stable/tutorials/scripting/gdextension/index.html
• https://godotengine.org/article/introducing-gd-extensions/