I found that I can address the issue by preventing the wxDirDialog from using the IFILEDIALOG interface from being used. My ShowModal() method now looks like this:
int wxDirDialog::ShowModal()
{
WX_HOOK_MODAL_DIALOG();
wxWindow* const parent = GetParent();
WXHWND hWndParent = parent ? GetHwndOf(parent) : NULL;
// Use IFileDialog under new enough Windows, it's more user-friendly.
int rc;
#if wxUSE_IFILEDIALOG
if ( wxGetWinVersion() > wxWinVersion_Vista )
{
rc = ShowIFileDialog(hWndParent);
}
else
{
rc = wxID_NONE;
}
if ( rc == wxID_NONE )
#endif // wxUSE_IFILEDIALOG
{
rc = ShowSHBrowseForFolder(hWndParent);
}
// change current working directory if asked so
if ( rc == wxID_OK && HasFlag(wxDD_CHANGE_DIR) )
wxSetWorkingDirectory(m_path);
return rc;
}