An application adds a new button using IFileDialogCustomize_AddPushButton. The application obtains IServiceProvider_iface through QueryInterface using the parameter IFileDialogCustomize_iface of the callback function IFileDialogControlEvents_OnButtonClicked, and then uses IServiceProvider_iface to pass IID_IFolderView and IID_IFolderView2 through IServiceProvider_fnQueryService to obtain IFolderView2. After that, it obtains the selected files and folders through IFolderView2_GetSelection. Currently, the implementation of obtaining IFolderView2 through IServiceProvider_fnQueryService is missing and needs to be added. -- v10: dlls/comdlg32：Add the implementation of IServiceProvider_fnQueryService to obtain IFolderView2 https://gitlab.winehq.org/wine/wine/-/merge_requests/10193