Hello Katherine,
I am not sure you ask me or not, I don't know much about Flash, but I will share how I get the result that I want to you or others.
I have to load a lot of text™ from text file, but when I save as ANSI format, it won't work, so at that time I think about URL encoding might help, but it still won't work.
Finally, I save text file that contain the unicode format and save it as "Unicode big endian" format, and it works.
My conclusion is I still don't know how to make URL encoding of %99 (TM) work for Flash, but my text file that work fine right now mixed with unicde format(such as TM, 1/2, 3/4, etc.) and URL encoding such as "&" (%26), and then save all of them as "Unicode big endian" format, and it give me the result that I want.
I hope it will work for you also.
Regards,
Kathryn