So I had 2.6 RC1 installed and still could not access the url which is file://s:\getmachinename.vbs (and this works on 2.5.8). I uninstalled 2.6 RC1, deleted the spark folder in program files and appdata/roaming and then installed build 12103 today. Still the url which points to a file does not work. I changed the file path to file:///s:… as you formatted above, restarted spark and it made no change in spark. Still does not work.
That was it!!! Fixed it like a charm. Who would have guess. the next openfire or client control plugin release should note that on that page. Thanks again.