GNOME core components include:

 gnome-control-center  : Elaborate windows/theme reconfig tool.
 gnome-display-properties   : Monitor config
 gnome-window-properties : some windows properties.
 gnome-*-properties  
 gnome-*-control

Adjust screen brightness ~

 gnome-panel-screenshot
/usr/bin/gnome-default-applications-properties  : default music player, etc

gnome-open  /home/thava  -- brings up smplayer! why ?
xdg-open is similar to gnome-open but u can use it on kde too.

See /usr/share/applications/nautilus-folder-handler.desktop
gnomevfs-info  <file> displays MIME information.

ubuntutweak  -- good package for reconfig.

MIME config changes:
  /etc/gnome/defaults.list
  ~/.local/share/applications/

Also see: .local/share/applications/mimeapps.list

After editing above, run this:
   sudo update-desktop-database
Also see: update-mime-database
This will create a mimeinfo.cache file in the applications subdirectory for each directory in $XDG_DATA_HOME:$XDG_DATA_DIRS

http://library.gnome.org/admin/system-admin-guide/stable/mimetypes-registering.html.en

Applications are registered by creating a MimeType key in their .desktop  
entry file and listing each MIME type separated by a semicolon. 
The MimeType key should only be used in .desktop files whose Type key has 
the value “Application”. 

Default applications to use for specific MIME types should be specified 
in a file called defaults.list. This file is located in the applications  
subdir for each directory in $XDG_DATA_HOME and $XDG_DATA_DIRS. 
See also: ~/.local/share/applications


 Example 5-4  ~/.local/share/applications/defaults.list file :

[Default Applications]
application/pdf=evince.desktop
text/html=epiphany.desktop
text/plain=gedit.desktop
image/jpeg=eog.desktop
image/png=eog.desktop
text/xml=gedit.desktop

Adding or Modifying MIME types
-------------------------------

To add one or more MIME types for all users:

 * Place the Overrides.xml file in the /usr/share/mime/packages directory.
    or ~/.local/share/mime/packages dir (for single user).
 * Update the MIME database by running update-mime-database using the 
   system account.
      update-mime-database /usr/share/mime (or user specific one)

  *  gnomevfs-info  <filename> 

    * Control Center: This collection of applications customizes the 
                      GNOME environment.
    * gnome-panel : This application provides the tool bar and menu system:
          Interacts with:
                gnome-session; session-manager; etc. 
    * nautilus : Manages desktop icons and provides a file manager.
    * gdm : GNOME Display Manager (login screen) . See gdmsetup
    * GNOME VFS: Uses mime types for transparent file access.
    * Window manager. None specified. Can use Metacity, Sawfish, ... 

gnome-session  : This sets up GNOME desktop environment.
Config file: /usr/share/gnome/default.session 

gnome-wm  (Script /usr/bin/gnome-wm to start window manager)
Script also identified in config file: /usr/share/gnome/default.wm
Also uses ~/.gnome/session (Mine is empty) 

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Linux OEL yum repository configuration
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Adjust screen brightness ~