open" csv record format comparison internet path-finder 6

i am controlling java struts, eventuality user controlling following codes

response.setcontenttype("application/vnd.ms-excel"); 
response.setheader("content-disposition", "attachment;filename=" + filefullname);

firstly i wish repremand place question... :) i hope
that assistance me.

the blunder summary i i try open record internet path-finder is

"c:\documents settings\username\local settings\temporary internet
files\content.ie5\qxj0p436\btbillsdfjlsfjk.csv' found"

i am perplexing "open" csv record format excel. allows me to
"save" record ever office i wish nonetheless i don't wish that,
i only open file. always worked past so
i'm wondering since record 'missing'.

any ideas?

thanks advance.