Can't Open New Module

Hello, newbie here.

Can’t open a new module - “Oper-Export.vmod” Error Message - “Invalid VASSAL Module”.

My Mcachine Specs:
Dell precision PWS 390
XP 2002 SP3
Intel Core 2 CPU 6700@ 2.66 GHz
3.25GB RAM @ 2.66 GHz
ATI Fire GL V7200
Java - 1.6.0_22

Thanks, CHB

What module are you trying to open?

…and is it something you downloaded or something you made or modified?