how to set a assembly's properties without the use of a GUI

I want to set the Description of my .exe file (it is a .NET
assembly).
You know that description that is seen in Windows Task Manager
process
tab. Almost every running process has got one. They can be a whole
sentence explaining what the process is about.

I need a way of setting this description of my .exe without any GUI.
I
need it to be set from a command line tool or something alike.


Is there a tool like that? Maybe something built into Windows?