opb:
Crisp files may be compressed by the use of a neat little program called Rollingpin which renders the crisps into a .dst file.
Ooooops! I saw a little package marked dst. I thought it was full of dysentery prevention tablets so I pulverised them with my rolling pin, mashed in a dash of tabasco sauce, and put it in Februs jug of Red Bull.
Alas, whatever was in there doesn't seem to be working because Februs has been closeted in the lavatory all night.