how i can save big text files in web player?

i watch the fusion fall game and they with the webplay sabes large file size, beacouse it download content and the second time that i play this game, it dont download again

and the same way with monkey quest

if i see mi setting the monkey quest appears with 200MB

how they culd do that?

i just need write a long text file but i dont know how

It's called caching and it's automatic, but you can't save text files from your code with webplayer.