ie6 generated uncanny worksheet name doing trade java application

i am encountering blunder

test(10)[1].csv record can't found during 
c:\documents settings\ron\local settings\temporary internet files\content.ie5\pq0stuvw

when perplexing trade csv record controlling following codes.
anyone have any thought wrong? emanate does start ie7 / firefox wholly specific ie6.

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