disclaimer: This suggestion may be too expensive and/or breake several "terms of use" for the program that originally are dealing with the file format (I have no idea really). Anyway suggestion simply goes like this: If an user have uploaded an ASC file, some other user (that doesn't have...
Again, they do not work for me - about half the ones I tried from the table give different results to what is shown.
234 gives Û
227 gives Ò
(If the characters are not consistent between browsers, those are a capital U with ^ and O with left angled ' accents; probably 219 and 210 in the chart).
To enable the entry of all Unicode characters by code, create a string registry value in Computer\HKEY_CURRENT_USER\Control Panel\Input Method called EnableHexNumpad with the value of 1. Then you'll be able to enter any character by holding down the right Alt key, pressing the + button on the numeric keypad, entering the hex code (2, 7, 1, 3 in your case), and releasing the Alt key. You may need to log off and back on before this input type is enabled.