I’m sorry to hijack a thread from a while ago, but I’m getting this behaviour in my app on Windows 7 SP1 (FolderItem.ShowOpenFileDialog does nothing under Windows 7 SP1). The call to ShowOpenFileDialog just returns immediately with no UI shown (or at least I can’t see it). It works fine under MacOS and Windows 10 but not on Windows 7. Unfortunately I can’t reproduce it in a small test app – that works too – so I guess it must be something to do with my app. But I can’t figure out what it is. I was wondering if anyone here has any suggestions?