We're having an issue described exactly by this blog post - http://helpx.adobe.com/cq/kb/CQ5AuthenticationPromptInIEForOfficeDocuments.html
Basically, when in IE and downloading an excel/word/etc file from the DAM, an authentication prompt appears. It can be ignored, but our users would like it not to do that as it might confuse. We tried the fix listed in the post, putting a blank OPTIONS.jsp file in both /apps/sling/servlet/default and /libs/sling/servlet/default but it has not resolved our issue.
This is happening on our 2 dispatcher servers (but not the publish server, strangely) with CQ 5.6, is there an update to the fix in the post? Another way to get rid of that prompt?
Thanks.
Edit: Here is a shot of the prompt, doesn't have the same wording as the post but seems to be exactly the issue in every other description. The blacked out part just has our server name.
Sorry, looks like it won't upload the image. Basically a standard windows prompt that says "Connecting to <server>" and asks for username and password. We're using Windows 7 and Office 2007.