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$file_attach{'testdoc.doc'} = '/home/path/to/document/testdoc.doc';
etc...
...
                            Disposition=>'attachment',
                            Encoding =>'base64'
                            };

(header)
Content-Type: multipart/alternative; boundary="_----------=_AAA"
...
    Content-Transfer-Encoding: base64
    Content-Type: application/msword; name="test2.doc"
    --_----------=_AAA--

(header)
Content-Type: multipart/mixed;
...
------=_NextPart_000_AAAAA
Content-Type: application/msword; name="test.doc"
Content-Transfer-Encoding: base64