1. Backup means you need to save the files which would be ovewritten by the installation of this minimod somewhere else ( create you own folder somewhere in your private or alike )
2. You do not need to open it, but to download it ( save ), and then open it with a program like winrar ( 7zip and winzip might do the job too, not sure )
3. As far as i understand you need to extract the files into your main installation directory of Rome Total War; the files you extract contain the folder "EB" with only needed changes for the mod. At the same time, there is a folder "EB" in your main directory of RTW ( the actual sub mod, the Europa Barbarorum ), and then all the minimod files of FD mod will replace/add the containt of the EB folder in the apropriate parts ( namely: EXPORT_DESCRIBE_ADVICE in the main EB folder, EXPORT_ADVISE in the EB subfolder "text", and finaly, the folder "eb_scripts" subfolder in your EB installation ). That´s why you can also simply extract the downleaded files into any other private subfolder of your choice, and then copy&paste the extracted "EB" folder into the same one in your main RTW installation directory.
I hope its not too complicated the way i´ve explained it; correct me anyone if i´m wrong...
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