Hi Wilson Ochoa,
There is no built-in option that allows you to preview the items in FileManager control. The easiest option to preview the image is enabling files download
for the file manager and hide the "download' link for items which extension is not valid for an image.
Inside ~/Sitefinity/Admin/Files.aspx.cs override OnPreRender and there subscribe to PreRender event of the RadGrid ( radGrid.PreRender += new EventHandler(radGrid_PreRender);). The disable all links for items which are not images
sender, EventArgs e)
var grid = (Telerik.Web.UI.RadGrid)(sender);
GridDataItem dataItem = itm
var column = grid.MasterTableView.Columns.FindByUniqueNameSafe(
TableCell cell = dataItem[
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