How long are these filenames?
Amiga filenames can only be 107 chars long.
Your ram: disk already supports all 107 chars so place the archive in your RAM: drive and extract it there. That will probably solve your problem quickly.
In the future you should install a filesystem to your hard drive that supports long filenames (107 chars) such as PFS3AIO edition free from Aminet. It is super super super fast and does all 107 chars if you activate the long filename option.
PFS3 has a limitation of only 104GB per partition. So if your hard drive is larger than that you have to break it into multiple partitions.
