AceStream - Save downloaded/streamed file?

Hi, is it posible to save ( for example .mkv ) downloaded / streamed file?

I remember when it was in beta, i have just go to C:\ArcTemp and Copy/Move file from that folder to my 2nd HDD, but not its crypted, i have try to re-name file to MKV but it wont play ;(

Any ideas???
TNX.