The issue is that your file contains a non-ASCII character (a SUM symbol). The way that the program works is that we allow the iPhone to try and determine the "file type" of the file that came from the email. It scans the file and sees this non-ASCII character, then tries using UTF-8, which this file is not in the UTF-8 format either, thus it's failing because of that. We really do not have a good way to deal with issues like this due to the limitations on the iPhone OS. The best thing would be if you could either remove the SUM symbol or replace it with a word.