Recently quite a lot runs are rejected that are done on minesweeper clones (Ms_arbiter, Minesweeper X,Vienna Sweeper). That is beacuse they all have demo function wich are small video files that can be played on the said above minesweeper clones. It's best to do no RNG manipulation runs on theese clones beacuse we are sure that nobody will slip through with a set seed run. (Of course regular windows 98/xp/7 don't require that).