Can't access Wiki files

I have a client who surprised us with Wiki concerns after moving them from 106 to 10.8 server. We had no idea they used the Wiki functionality until a month later! There seems to be data in the Library>Server>Wiki>FileData folder, but none of it will populate when opening the Wiki pages. Most instructions I've seen have to do with data migraiton, but that's already happened and the old server has been re-formatted and re-purposed. Does nayone have any insight? Thanks!