An interesting problem.
.but not impossible

It was a Nokia site,
.no doubt the documents still exist,
.we simply do not recognize where to get them from.

Nokia probably has an archive copy,
.short of summoning Ethan Hunt and his gang:

The website would have been poached by someone.
And my guess is that there is a copy of what you need
.on one of several document mining operations.

If someone around here
.has a clue as to what kind of file names to search for,
.we might still have a chance.