Hi, just posting an update for my above question re GW 2012.
After reading the error message and checking the Program FilesAdvansysFormativ directory I noticed that there were a number of msgclass<version number>_0.txt files. I copied / cloned the “msgclass8_0.txt” file and re-named it to “msgclass12_.txt”.
This fixed my issue and the formativ creator is once again functioning in groupwise 2012. I realise that this might be a temporary work/around and just wondering if this is an accepted fix for my problem? or is there a newer version of this class file available for download? or is the GW 2012 still not yet officially supported (despite the product information page stating that it supports 8.0.1 and later)?