My mobile phone has Polaris Office default installed on it, but when I open some files I cannot see special characters, like "á", "à", "ç" etc., there is just a space character when it would have one of those special characters...
Palliatively, I installed Kingsoft Office, although it is so big for my device (it is about 13MB in size, and all my internal storage is just 180MB)... So I had to remove some apps to install it.
Well, it does the work well: show special characters without issues.
But I wait for a solution for Polaris Office...