Add some "local" declarations to scripts/xamppDefaultPass.nse. Without this I

was getting errors like

SCRIPT ENGINE: [string "Global Access"]:1: Attempted to change the global 'socket' in c:david
mapmswin32DebugscriptsxamppDefaultPass.nse - use nmap.registry if you really wan
t to share data between scripts.

Notice that there's another issue with the error message, which is that
backslashes in the file name are being interpreted as beginning escape
sequences (see how the '\n' in "C:\david\nmap" turned into a newline.

scripts/xamppDefaultPass.nse

@@ -15,7 +15,8 @@ require "shortport"
 portrule = shortport.port_or_service(21, "ftp")
 
 login = function(socket, user, pass)
-	res = ""
+	local status, err
+	local res = ""
 	status, err = socket:send("USER " .. user .. "\n")
 	status, err = socket:send("PASS " .. pass .. "\n")
 
@@ -37,7 +38,8 @@ login = function(socket, user, pass)
 end
 
 action = function(host, port)
-	socket = nmap.new_socket()
+	local res
+	local socket = nmap.new_socket()
 
 	socket:connect(host.ip, port.number)
 	res = login(socket, "nobody", "e0e0e0e0")