Hi Virus :-) Not only with this extensions. Also a *.TXT can be a pif. Make a pi and rename it, double click it and it do not open in Editor it runs as pif!!! So be careful with txt-files too or better with ALL attachments. This one was some of this sort. Only a txt and a dat. I don,t have opened it (never do this, even the files comes from best friends), I saved it and checked it first. NAV detects this worm immedialy. Robert