Starting with the Q1 2012 release, the RadFileExplorer gets a new display mode - thumbnails. In this mode the grid with folder and file details is replaced with a listview, which shows the current folder in a display similar to the Windows File Explorer's medium icons view. The best scenario for this new display mode is when you want to display thumbnails of image files - these will be shown instead of the default image file icon we have in the control. Other supported files (e.g. office documents) will show up with normal icons.
The size of the thumbnail icons can be easily changed, so if your project needs larger ones there is nothing to worry about!
The new file explorer view is enabled by default for the RadEditor's ImageManager dialog. If you want to keep the old grid view in the image manager, you can set the editor property ImageManager-ViewMode="Grid". The default value of this property, starting with Q1 2012, is "Thumbnails".
You can see a live demo of the new display mode on our examples website at http://demos.telerik.com/aspnet-ajax-beta/fileexplorer/examples/applicationscenarios/listviewintegration/defaultcs.aspx. To see the updated image manager in RadEditor, you can go to any editor demo - for example http://demos.telerik.com/aspnet-ajax-beta/editor/examples/xhtmlvalidatortrackchangesformatcodeblockdialogs/defaultcs.aspx. The keyboard shortcut for opening the Image Manager dialog in the editor is Ctrl-M (of course, you can also click the dialog icon in the editor toolbar).