Don’t know if it’s related or not, but I had a problem two years ago with Windows 7 SP1 and ShowOpenFileDialog. It returns “Nil” when you attempt to open “Documents”, “Pictures”, “Music”, and Videos". Same code on Windows 10 works fine.
https://forum.xojo.com/t/selectfolderdialog-returns-nil-when-documents-pictures-music-videos-selected-in-left-pane/48964