Bulk Import Users - Spanish Characters

@/-

Summary

I need the Bulk Import Users tool to allow me to use Spanish characters.

Content

We have a user integration that creates all our usernames and allows all the Spanish characters, apostrophes, dashes, and spaces. Our bulk import users allows me to match up usernames with dashes and spaces but not apostrophes and Spanish characters. 

The Username Allowed Characters in System Options has the following in it:  A-Za-zà-ÿÀ-Ÿ0-9_.'@/-

Does anyone know how to get the Spanish characters to work in the bulk loader? Is there a Registry key or something I am missing?