fix amazon file store backend, http://bugzilla.pculture.org/show_bug.cgi?id=14079
fix amazon file store backend, http://bugzilla.pculture.org/show_bug.cgi?id=14079

eloquence/unisubs,ReachingOut/unisubs,eloquence/unisubs,ujdhesa/unisubs,ofer43211/unisubs,ujdhesa/unisubs,pculture/unisubs,pculture/unisubs,wevoice/wesub,pculture/unisubs,wevoice/wesub,wevoice/wesub,ofer43211/unisubs,ujdhesa/unisubs,ujdhesa/unisubs,ReachingOut/unisubs,ofer43211/unisubs,norayr/unisubs,ReachingOut/unisubs,norayr/unisubs,ofer43211/unisubs,eloquence/unisubs,ReachingOut/unisubs,norayr/unisubs,norayr/unisubs,eloquence/unisubs,wevoice/wesub,pculture/unisubs