Views the current file.
•<Default> – normal view file or folder size depending on selection (like by pressing F3).
•Alt – open file with Alternative Viewer, like by pressing Alt+F3.
•Embedded – open file with Embedded Viewer, like by pressing Shift+F3.
•OneFolderSize – calculate size of selected folder.
•FolderSizes – calculate sizes of all or selected folders in the list.
•FixSizes – remember sizes of selected folders in the current folder.