In your messgae link in the menu above ('You have no messages' or similar if you have some to read) is a 'export button.
This export button will save a file to your computer to a folder you point it to. The file will be in XML format.
The modification did not come with any viewing software for these files, Mike (Midnight Star) has written one for us (and others) to use. He has a support room for that viewer software, located :-
In that room is will/is a download link for the program. It does require the installation of M$ .NET software to run.