Propriety on some .nef (nikon) files, freeze nautilus

Click right on .NEF file
Click propriety

propriety windows open, but is freezed. Do not crashes, the process seems tu run using few CPU resources, but clicking on the window propriety nothing happens.
CLicking on the parent nautilus windows, nothing happen but clicking on close symbol, ubuntu can force Nautilus to be closed.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nautilus 1:3.4.2-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic 3.2.28
Uname: Linux 3.2.0-31-generic x86_64
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
Date: Mon Sep 24 23:41:31 2012
GsettingsChanges: org.gnome.nautilus.window-state geometry '800x550+0+24'
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)