Login asked when viewing .doc & .dot files

[marcvp]

Hello,

I have a strange problem; one of our clients gets a popup window which asks for a login and pasword when he tries to view a document with .dot or .doc as extension. When he clicks on 'Cancel' the page appears in his browser.

I'm not getting this popup but he claims that he and some colleagues are having this particular problem.

All the rights on the server seem to be corred. The site is hosted on a Windows-server with Plesk 7.5.

Does anyone has a suggestion ?

Thanks a lot in advance !!