problem with other web in same domain and permalinks

I created a new website in wordpress for a company that have many webs under the same domain.
The url for this new site is “www.ccee.ed.uy/posgrado”.
The thing is that in the same folder, there was another web installed for another service, and the url for this other site is “www.ccee.edu.uy/posgrado/upae/upae1.htm”
My problem is that now I can’t access the old web. I think this is because of the permalink in wordpress, he thinks “upae/upae1.htm” is part of my website, and is showing the 404 error page.

Is there a way to define an exception in the permalink or something in my wordpress so that when I go to “www.ccee.edu.uy/posgrado/upae/upae1.htm”, it shows the old page, and not my wordpress??

Thanks

P.S:I don’t have access to the other web and I shouldn’t move any of the files.