Hi There,
The solution proposed by @aLTeReGo may be an option for you. Just watch that you don't overload the log files with file activity events. Windows seems to log hundreds events for basic operations.
Another solution is to use a third party tool to monitor the file activity and trigger the event which could be displayed within your SolarWinds views. We develop a product called LANGuardian which uses deep packet inspection to capture file and folder names from network traffic. You can setup an alert if file X is not detected then an alert can be triggered. You can see an sample of the output at this link - http://demo2.netfort.com/Orion/SummaryView.aspx?viewid=35
Darragh