GB2312 Encoding and File Names

Hello all, 

I do hope I am in the right place for some help! I am working on a project =
that requires email attachments to be extracted to the file system. All was=
 working great until one of our kind testers tried with normal and simplifi=
ed Chinese; where I ended up with files of the name ?????.txt. 

Am using the module MIME::Parser to extract the files and after some great =
help from the developer I have realized that one need to override a method =
in MIME::Parser::Filer so that the correct file names are generated. 

One of the attachments in the test email is show below: 

360=E6=96=B0=E9=97=BB=E7=9B=91=E6=B5=8B-12-01-Chi Simp.txt 

I have tried to use MIME::EncWords and MIME::Charset to extract the correct=
 name from the MIME entity using: 

my $fname =3D decode_mimewords($head->recommended_filename); 

but this still does not work :( so I tried to compare what the file name lo=
oks like with the LANG with/and without UTF8

With LANG en_GB.UTF8 

360=E6=96=B0=E9=97=BB=E7=9B=91=E6=B5=8B-12-01-Chi Simp.txt

With LANG en_GB 

360=EF=BF=BD?=EF=BF=BD=EF=BF=BD?=EF=BF=BD=EF=BF=BD??=EF=BF=BD=EF=BF=BD?-12-=
01-Chi Simp.txt

Now this is what happens when I extract the file with my new method: 

With LANG en_GB 

360=EF=BF=BD=EF=BF=BD=EF=BF=BD=C5=BC=EF=BF=BD=EF=BF=BD=EF=BF=BD-12-01-Chi S=
imp.txt

With LANG en_GB.UTF8 

360???=C5=BC???-12-01-Chi Simp.txt

The MIME file name appears as ?gb2312?B?MzYw0MLChLFPnHktMTItMDEtQ2hpIFRyYWQ=
udHh0?=3D

This is not may area of expertise so reaching out to you for some help. How=
 can one extract the file name from an email and have it reflect its really=
 Chinese name ?  Hope this make sense!
-- 
Thanks, Phil