The Download All as zip is using the wrong mime type

I used the new Download All attachements as a zip

However its using the wrong mime type and my browser wont kick in the associated ZIP program.

I capture this in Charles

GET /download/temp/download7eLL1153657.zip HTTP/1.1
Host extranet.atlassian.com
User-Agent Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.7) Gecko/20100106 Ubuntu/9.10 (karmic) Firefox/3.5.7
Accept text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Connection keep-alive
Referer https://extranet.atlassian.com/pages/viewpageattachments.action?pageId=1814659243

HTTP/1.1 200 OK
Date Thu, 04 Feb 2010 21:36:57 GMT
Server Apache-Coyote/1.1
X-Confluence-Request-Time 1265319417743
X-Confluence-Cluster-Node Member(Id=2, Timestamp=2010-02-03 21:58:31.502, Address=172.16.3.11:8088, MachineId=57136, Location=process:30421@atlassian11.managed.conteg)
Content-Disposition attachment; filename=download7eLL1153657.zip
Content-Type application/x-download;charset=UTF-8
Content-Length 606537
Keep-Alive timeout=15, max=95
Connection Keep-Alive

I think the mime type should be "application/zip"