Gnome,can't get file attrib window...

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Binary package hint: nautilus

ubuntu 8.04
gnome 2.22.1

after I remove "Realplay 10",nautilus can not get the file attribute of the files like .rm,.rmvb...

but when I create a new null .rm file,nautilus can get file attribute windows open correctly

ProblemType: Bug
Architecture: i386
Date: Thu May 8 13:06:03 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/nautilus
NonfreeKernelModules: nvidia
Package: nautilus 1:2.22.2-0ubuntu5
PackageArchitecture: i386
ProcEnviron:
PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=zh_CN.UTF-8
SHELL=/bin/bash
SourcePackage: nautilus
Uname: Linux 2.6.24-17-generic i686




if I choose a *.jpg file,nautilus can give a attribute windows to respond my request，as this
screenshot：

http://forum.ubuntu.org.cn/download.php?id=34286

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but if I choose a *.rm or *.rmvb file,only a notice windows opened:

http://forum.ubuntu.org.cn/download.php?id=33187

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any body could help me?