[Mod_gzip] Missing image size and mime-typ when using mod_gzip

[Rolf Suennen]

hi to all,
since two weeks i'm using mod_gzip and it's
a great thing ! :))

one question is left. in ms internet explorer 
the mime-typ and the image-size is missing
when pressing the right mouse button above the
image. it's impossible to save an image by
pressing the right mouse button using 'save as'.

this happens altough all image-files are 
excluded and i've tried to use mod_expires to
prevent pictures being cached.

has anyone an advice ?

t.i.a.

greets
rolf