Sorry, haven't considered OCI versions prior to 7.2, where we switched to a vanilla (all NetApp branding gone) reporting portal, aka. Cognos.
So, basically what's happening here is that Cognos does not access the filesystem directly, but expects an URL, which is served by a web server - in our case by Tomcat's Catalina, which is bundled in with Jboss.
It took me bit of poking around to figure out that apparently the root directory of the web service maps in OCI verions < 7.2 on the filesystem to %SANSCREEN_HOME%\jboss\server\onaro\deploy\reporting.war
So, doing the same thing I described before, but in the directory mentioned above, should work. The screenshot attached is of 7.1.x