fop and internet explorer issue

Ok I am seeing this wierd issue and I am clueless and
I am going nuts. Hope someone can help me with this
problem. 

I am creating pdf files from xml. I use saxon.

My files were working fine and I was able to open my
file in IE6.0 and now all of a sudden when I try to
goto the page in IE6.0, a window pops up and asks if I
want to download the file (??). For some reason IE6.0
thinks I am trying to download a file. 

Has anyone seen this problem before ?

The file opens up just fine in NS7.0. 

Any insight on this will be very helpful.

Thanks.
Mark

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