WIMP Server issues: creating tables for a plugin's use

I have a plug that works perfectly with a LAMP (Linux Apache MySQL PHP) server, but seems to be failing with a user running WordPress on a WIMP (Windows IIS MySQL PHP) server. *I* don’t have access to a WIMP, so I cannot test and debug it in detail. I tried to have the user patch the plugin code to try to capture errors from MySQL, but that is not working out.

The report of the problem is here: http://wordpress.org/support/topic/doesnt-work-54 and I have a Bugzilla thread here: http://bugzilla.deepsoft.com/show_bug.cgi?id=3. Are there some obvious things to check? The original user says he can use a SQL client to create tables in the WordPress database as the WordPress database user, but *I* have no way of verifying this.