Customizing fast-access buttons on left-hand side of File->Open dialogue in most Windows programs
See if you can tweak them with these instructions. This will only affect dialogs with the places bar on the side like the one you're displaying here. http://windowsxp.mvps.org/PlacesBar.htm
For other dialogs with the folder list on the side, Mehper's answer should work, but Opera isn't using that.
For Windows 7 Professional, Ultimate or Enterprise, I personally found these instructions easier: http://www.sevenforums.com/tutorials/85487-common-file-dialog-box-customize-places-bar.html, using the Group Policy Editor.
In short:
Open the Local Group Policy Editor (shows as "Edit Group Policy" when searching from the search bar)
Starting from User Configuration (and not Computer Configuration), drill down to: Administrative Templates -> Windows Components -> Windows Explorer -> Common Open File Dialog
Double-click the "Items displayed in Places Bar" item and edit as needed. (see the screenshot for an example)
The article also has a nice list of the strings to enter to access the common shell folders, for example:
- MyComputerFolder
- MyDocuments
- MyFavorites
- MyMusic
- MyPictures
- MyNetworkPlaces
- MyFavorites
- CommonDocuments
- CommonMusic
- CommonPictures
- Desktop
- Printers
- ProgramFiles
- Recent
- shell:desktop
- shell:documentsLibrary
- shell:MusicLibrary
- shell:PicturesLibrary
- shell:VideosLibrary
- shell:MyComputerFolder