I have an excel spreadsheet that uses a macro to open
another excel spreadsheet via Workbooks.Open(filename)

On my local drive this works fine and it opens the second
file, runs the query, and closes it without complaint.
When I run it via a network drive it works fine as well.

However, when I try to run it via a browser (i.e. put the
file on a web server and then open the url as
http://www.whatever.com/myfile.xls") and then run the
macro I get a runtime error 1004 stating "Method 'Open' of
object 'Workbooks' failed".

Any idea what is causing this?