How do i enable downloads from my site?

save files from site to disk

[gibiman]

I am busting my ass googling this problem .
I have a <Directory> directive which points to a local mount on my system .

<Directory "/bla/bal/">
Options Indexes
AuthType Basic
AuthName "xfer"
Require valid-user
AuthUserFile conf/users_xfer
AllowOverride None
Order allow,deny
Allow from all
</Directory>

Validation works fine , browsing the directory works fine , but I believe there is a catch
BECAUSE IF I CLICK ANY FILE FROM THAT DIRECTORY A DIALOG BOX APEARS WITH "SAVE TO DISK" BUT THE FILE SAVED TO DISK IS 0 BYTES .
Same with pdf's and docs which should be displayed on browser windows .