Show in folder's os.startfile fallback now runs inside the same
CoInitializeEx/CoUninitialize bracket as the shell selection, as ShellExecute
callers should. The Linux opener keeps XAUTHORITY, DESKTOP_SESSION,
XDG_SESSION_DESKTOP and XDG_CONFIG_HOME, so a file manager can reach the X11
display under GDM or SDDM and honour the user's mimeapps.list.
A Windows-only test calls the real ILCreateFromPathW and ILFree on a temp file
and pairs CoInitializeEx with CoUninitialize through the module's helper,
without SHOpenFolderAndSelectItems, so no window opens on CI.
Vito Sansevero
b3d732fdf1