File permissions and Ajax Explorer

The File permissons say R , W X, Ok, I guess R= read W=write, X= ???
what does the X represent ?
Another question, Is it possible to install and use a different “webftp” editor, other the AjaxExplorer ?
Thanks from Garry

x = eXecute

To your second question there are not many secure webFTP clients, but you can also install a local ftp client

Thanks, figures, …and thanks for the link for more details