Thanks for the additional information, which uncovers a bug in iSiloX. Since the .ixl file name path has spaces, iSiloX needs to add quotes around it in the command-line.
An updated beta, iSiloX 3.35b1b for Windows, has just been posted with a fix for this. Here's the URL to the download page:
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http://www.iSiloX.com/info/beta/iSiloXWindows.htm>
In the Windows Task Scheduler, delete the existing iSiloX task first to make sure that everything is in a good state before running the updated beta.