Try running "du -s /usr/share/* | sort -n | tail" in a terminal.

"du -s /usr/share/*" computes the disk usage in kB for every file/folder directly under /usr/share.

"sort -n" sorts the output numerically.

"tail" gives you just the last ten entries, the biggest files/folders. Are any of those around 85000kB, the size you think the big game is?