Where Did That Download Come From?
If
you download a file from the web, you can usually
find out exactly where that downloaded file came from
(including the exact web address) by pressing
Command-I when you have the file selected.
Once the info dialog appears, click on the
right-facing arrow beside More Info to expand that
panel and it will display a Where from header, and to
the right of that it will show the exact web address
from which the file was originally
downloaded.