Worked for me, here is a list of all the valid charsets try them all:

* utf-8
* iso-8859-1
* windows-1252
* us-ascii
* shift_jis
* iso-2022-jp
* euc-jp
* euc-kr
* big5
* euc-cn
* utf-16

http://livedocs.macromedia.com/coldfusion/7/htmldocs/00000250.htm

I’ve the same problem. When I upload a document (word, excel, …), the files seems to be uploaded correctly. But when I try to download it (using cffile tag), the file is corrupted (invalid charset I think).

Can you help me . Do you have found any solution ?

Thanks,
Ced