The CDs I have seem to be proprietary for Windows from the late 90s. But I also have PDFs through 2005 on my computer which I must have "acquired" at some point.

Yes the file names are something unknown. It has a software to access. They did a damn good job.

The browser app might be some outdated Windows application, that's the case with the MAD DVD too, but you can find the actual issue files in some folders