MS word keeps cache of the document that you are typing in a separate file hidden and with little weird name, usually virus files have such names but this is not a virus
file is undeleteable while MS word is running
this cache comes handy when your computer (most probably windows) carshes or electricity plays with you
next time you open that document (which you were typing while your computer crashed) MS word will automatically detect that file(s) and ask you to save the desired recoeverd file.
you can set the auto recovery file save time in Word options -> save
by default its 10 minutes
you can delete this file or keep its your call, before deleting its wise to check if it contains some data to be recoverd, word probably cannot read those files directly so open the orignal word document and word will see if there is any file for recovery.
