Reddo,
You were suckered by the apparent double suffix. If you have your Windows set not to show file extensions (suffixes) any that appear like xxxxx.txt have a hidden extension and show be considered extremely dodgy.
The latest virus doing the round comes with several attachments of various names; it gets in to your address book and sends mail with no subject line to everyone. Try this link for a fix
http://www.symantec.com/avcenter/venc/data/w95.mtx.html