The latest Betas no longer support opening a file in RAW mode.
One of the neatest uses for this ability is to capture user input from the console in a CUI compiled script, by opening the console in raw mode, as per here:
http://www.autoitscript.com/forum/index.php?showtopic=79275&st=0&p=571658&#entry571658
Jon's reason for removal is here:
http://www.autoitscript.com/forum/index.php?showtopic=95366&view=findpost&p=761026
and I wouldn't want him adding back in c