During running MES with Nonlinear Material Model (drop test) using Autodesk Simulation Multiphysics 2012, this "
forrtl: severe (24): end-of-file during read, unit 24, file C:\axdrop30042012\axdrop-fbcush-01052012BAC211.ds_
This is a known bug, and got fixed in ASIM2013.
So please have a try on ASIM2013.
For older versions, I'm not sure if a hotfix for this issue would be available or not.
If this response answers your concern, please mark it as "solved".