IE 6.0 sp1 downloads the site

Hi group,
i'm having some trouble with customers using IE 6.0 sp1
When they try to access a site which has mod_gzip installed,
they get a popup for downloading the the site ?-(
Is anyone having the same problems?
And what can i do to prevent this from happening?

our gzip conf

mod_gzip_on Yes
mod_gzip_can_negotiate Yes
mod_gzip_dechunk Yes
mod_gzip_minimum_file_size 600
mod_gzip_maximum_file_size 0
mod_gzip_maximum_inmem_size 100000
mod_gzip_keep_workfiles No
mod_gzip_temp_dir /tmp
mod_gzip_item_include file \.html$
mod_gzip_item_include file \.htm$
mod_gzip_item_include file \.txt$
mod_gzip_item_include file \.php$
mod_gzip_item_include file \.js$

the site : http://www.trosradar.nl/





Regards,


Niels Berkers
TROS Internet