Mailcleaner: Files containing CLSID's are trying to hide their real type

Due to "no budget" for anti-spam solution, I have decided to implement Mailcleaner's Free Anti-Spam Solution.  My first impression is it is a friendly anti-spam solution and I recommend it if you don't have a budget for anti-spam server.  It is very easy to install and configure.  Upon observation, it is blocking some valid emails that have attachments and the error was: "Files containing CLSID's are trying to hide their real type". I've searched and found the solution, just disable this one: