Thanks, but I am aware of all that. The "default" characterset of our old mySQL was Latin_1. The default set of version 4.1.+ seems to be Latin_1 Swedish, which may be fine for our young master Svensk, but does seem to have corrupted the zip files and avatars. Originally, dELTA made a backup of the database, just before the old server went dark. That backup was "restored" through the usual mySQL restore function and both the avatars and attachments were toast. Natuarally, the new ones work, because they were created with the new characterset. There is also the issue that we have gone through two vBulletin upgrades in the process and there may be some issues with the upgrades as they use the new mySQL.
I have since installed several copies of the actual database files on other working version of the forum that I downloaded a day before dELTA took the mySQL backup and have manually reinstalled all the avatars on the current database. This was not such a great task, because there were only 64 of them. However, there are over 830 attachments, so a manual approach does not seem as practical.
However, cutting and pasting them into some of the copies of the current database worked and others didn't and I suspect it is an issue of permissions for read and write. I am working through the options as I try to keep up with real world work as well and should have it working soon. On some of the test forums, avatars would work and attachments not, and on others the avatars didn't work and the attachments did, even though both came from the same source files and both were copied and pasted in, rather than "restored" through mySQL. Go figure why.

Also we are in the process of downgrading the mySQL version because vBulletin recommends against v4.1.+, so that issue may go away and the old attachments from my back work correctly with only the few "new" attachments needing to be manually re-installed and most of them are simply text files anyway.
And it shouldn't be difficult to "rescue" a particular zip file for completion of your project, if you can identify it, I probably can upload it here for you.
Regards,