In Windows, in this particular case Windows Server 2012, normally if something is using a lot of RAM you can use the Task Manager or Resource Monitor to find the PID / user and kill it or ask them to kill it.
Some programs, like SAS, use mapped files for some particular database-like joins/operations that have the potential to grow exponentially in size, such as when a "bad join" occurs (unexpectedly creating exponential duplicates).
Using some MS TechNet tools like RAMMap I can see the files that are eating up all the server's memory and threatening to cause a crash/freeze. I have no way to identify the process or user associated with that file, however.
How can I find the related PID or user?