Prevent Windows from mapping.wt files

When running MongoDB 3.0.4 on Windows Server 2012 R2 above the caching that WiredTiger performs, Windows will also cache the .wt data files as mapped files in memory. This causes the total OS available memory to increase towards 100% and prevents other processes from running effectively on the same server.

Other DBMS' data files do not get mapped in the same way so I would assume that there is a way of preventing this behaviour and therefore allowing more OS memory to be used by WiredTiger and other processes.