By using a Nice utility Gloobus you can view almost all file type. Gloobus is a free application for GNU / Linux . Gloobus-Preview is an extension for the Gnome Desktop designed to enable a full screen preview of any kind of file. It allows instant access to a variety of file types without the need of opening their default application.
You can access the preview mode from several ways, right click on the file you want to preview and choose “Preview” or simply hit the Space key on your keyboard.
Gloobus can currently preview over 40 file formats and its family is still growing:
Images: jpeg / png / icns / bmp / svg / gif / psd / xcf
Documents: pdf / cbr / cbz / doc / xls / odf / ods / odp / ppt
Audio: mp3 / ogg / midi / 3gp / wav
Video: mpg /avi / ogg / 3gp / mkv / flv
Other: folders / ttf / srt / plain-text
How to Install In Ubuntu 9.10
$ sudo add-apt-repository ppa:gloobus-dev/gloobus-preview
$ sudo apt-get update
$ sudo apt-get install gloobus-preview
$ sudo apt-get upgrade (To upgrade to the patched nautilus)
Finally, restart nautilus
$ nautilus -q
$ nautilus &