how can i decode the unicode string in attachmemt using TIdPop3

Hi All,

below is one of my receive bodies using TIdPop3. as you can see, this
body is encoded with base64, but indy can not properly decode it, how can I
do?

thanks

------------=_1142252755-6376-0
Content-Type: text/plain; name="attachmemt.txt"
Content-Disposition: inline; filename="attachmemt.txt"
Content-Transfer-Encoding: base64

uL28/sTayN0=                                 //actually content is a unicode
string with 8 bytes

------------=_1142252755-6376-0--