This is a simple Word 97 macro virus.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
This variant disables the built-in macro virus protection and replicates during opening and closing. The virus contains the following commented line on the bottom of its code:
'ThisDocument v 1.0 1999 W97M/Nsi.B
W97M/Nsi.B is functionally like W97M/Nsi.A. The commented line in W97M/Nsi.B is:
'Psycode v1.0 1999
Date Created: -
Date Last Modified: -