Worm.Explorezip is a form of trojan. Discovered in Israel, this
worm damaged several systems around the world in June of 1999. This
worm propagates via email as a file "zipped_files.exe".
When executed, the Trojan searches the hard drives for certain files.
When it finds these files, it makes them 0 bytes long, causing the
data to be unrecoverable. A sample of the email is as follows:
Message Body: Hi <Recipient Name>!
I received your email and I shall send you a reply ASAP.
Till then, take a look at the attached zipped docs.