a5e64d83_ureStatus20120119____XWiki_org__Status_as_of_2012_01_19
[Feature] Large Exports (make it possible to export files larger than 500MB by writing on disk) [Status as of 2012/01/19] 
An extension exists for this. Not in XWiki Platform and we really need it in XE by default
Feature Status - Jan 2012 (Blog.FeatureStatus20120119) - XWiki.org
Status as of 2012/01/19