I've found old (2003) "Multimedia encyclopedia" or so it wants to be called. I'm gonna look into it and see if i can get to actual definitions, it's old enough to hopefully not require internet to work. It's intended for poland, and i'm quite sure not everyone had access to internet back then over here.
As a sidenote, it has some addon about EU which is intresting because 2003 is berfore poland had joined it.
Quick reminder that graphic designers used to do stuff in 2003.

Glossing over details of mounting CDs in freebsd (my archive pc runs it) we have bunch of files on the CD nr 1, some .exe's including "Autorun.exe" and "Instaluj.exe". it's name means (as one might suspect) "install". There are also .swf files which are if i remember correctly flashplayer "executable" files.

Edit: typo

I'm afraid it's java there's lots of .jar files in there. I dislike java.
Apparently Java is used by small html files with not much more than an <applet> tag which uses java to display jpeg. In that html file in <applet> there's a parameter that points to .ivr file that contains some magic metadata and file name that ends with .jpg. this metadata does not look useful to me.
Also names of those files seem to be their md5 hashes. You know, to make it more painful to look at.
There are 144 sets of html ivr and jpg files. Those are pictures of well-known places like castles, rustic town squares etc, also (despite being jpegs) they don't seem too compressed.
In another directory there's bunch of html files with applet tags pointing to jar files. I've unpacked one file and found this. I must remind you that it's an encyclopedia or something.
Also i begin to suspect that the directory "ie6pl" contains polish version of famous Internet Exploder 6.
Looks like that CD 1 doesn't contain actual encyclopedia anyway. I'm going to move on to next ones.
CD 2 seems to contain far less files. It's still being copied over to archive pc's harddrive and then i'll copy it to my main workstation, funny how reading data from CD takes longer than rsync-ing it over my network.

At first glance i see that directory ie6pl seems to be on this cd too (dunno why) and that there's data3.cab and not much more. It's still copying.

Edit: typo

Ok, i've got those files, it appears that it contains Adobe Shockwave installer and ie6pl directory that (presumably) cointains IE6. Also there's data3.cab, let's unpack it and see.
I've had to copy data1.hdr from CD 1 because it looks like i have to have headers for those InstallShield "cabinet" files to extract them.
It didn't really work, there were pretty much no files which is strange, i'll collect all .cad files from all three CDs in a separate directory and extract them all later.
not much more to see on CD 2, let's see the last one.
CD 3 contains data4.cab (as expected) and same stuff as CD 2 and 1 did which is ie6pl and Shockwave installer
oddly enough there seems to be no difference in size or file count between extracting only those found on CD 1 than those found on all CD s
Now all there's left to do is to try and decipher those .vol files i kept seeing around and having no idea what's in them.
Well, 7zip didn't didn't decompress it.
binwalk seems to be doing something, that's cool.
Filling my smaller disk to it's brim is what it was doing.
To clear things up it's a small 256GiB disk with no compression, for system boot and other tasks that require fast disk but not lots of storage, my usual working directory is on in, but looks like i need to move it to compressed 1TB ZFS drive and maybe tell binwalk something.
This "something" turn out to be flag -r (delete carved files).
I've found and am binwalk-ing file containing actual definitions, but binwalk has no idea whatsoever about filenames, either i find how to get them or i'm going to have find a way to automagically name them.
All those files seem to have a <script> tag that has object definition in some ancient form of JS, (i've copy-pasted it into node,js and it worked despite variable name beginning with a $) as a way of storing metadata, this is cool because it allows me to write a script that automagically renames those files to their titles and/or copies the entries to a SQL db.
after i figure out how to fix the encoding of course
As is commonly known it's the web browser that knows and understands all the weird character encodings. So i've asked my librewolf to tell me and it says it's windows 1250. I've told that to iconv and it sure did convert that sample file i have, which is cool.