Question about resource checks

Question about resource checks

I'm trying to setup a resource check on some of our server monitors. What I want to do in particular is check that a file exists (alert if it doesn't exist) -- this file would be c:\inetput\wwwroot\loadbalancer.html.
I would like also like to check the contents of the file for "OK" (alert if OK is not in file).

I have tried a Content Check and that check doesn't see to be affected if the actual file doesn't exist. For example, I renamed the file on the server and the check continues to be displayed as "UP".

The Availability Check appears as "UP" even if the file doesn't exist. I could be misunderstanding how that check works since I have to select either Added or Deleted when I create the check.

Does anybody have any thoughts on where I'm going wrong with this?