IE6 refuses to allow AJAX requests on page to load

having developed and tested diligently on Firefox and IE6, I am now not
so pleasantly surprised to find that my ror pages are refused by IE6:

“Some files can harm your computer. If the file information below looks
suspicious, or you do not fully trust the source, do not open or save
this file.”

File name :

File type :

From :

Would you like to open the file or save it to your computer?

[Open] [Save] [Cancel] [More Info]"

Unfortunately, all I’m doing is making a call to a ror method, which

render :update do |page|

Is this a problem that others have come across? Everything works
perfectly from my local IP based testing server. It works fine remotely
on Firefox, just as it does locally. Safari is OK too.

I am sure that there’s something obvious here: I’ve set the server to be
a trusted site, and it makes no difference. Security set to low. The
problem seems to be that IE sees the request as a foreign file type, and
not an xmlHttpRequest…the page is running a Google map in it, and it
works fine, so AJAXiness per se is not the issue, I don’t think.

Any ideas?

A bit more: the problem may come from appended session data on the
method name, but I can’t prove it.

In case that helps.