As far as I can guess, that line connects to WMI service so he can later get a file listing from it - allowing the script to work on remote machines identified by name.
Probably not necessary in your case, but I guess useful if you wanted to make a script to process a similar file from various employees machines or something?
If you haven't seen this site, I learned my limited WSH skills from here:
http://www.winscripter.com/WSH/default.aspx