Browser contains icons. Icons are actually links to files. Icons can be viewed as thumbnails in three sizes, as descriptions or as a file names. Files can be inserted or dropped into browser. Icons can be moved inside one directory. You can select range of items with Shift+LMB, toggle selection of single item with Ctrl+LMB (to delete more items at once). LMBx2 will set current texture for primitives, apply texture to selected polygons or open clicked world. There are few very useful operations for selecting polygons in world and option to add all textures from world to browser.