cannot !packhdr with UPX: superfluous data between sections

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Put upx.exe to a location searchable in %PATH%
2. Put !packhdr "$%TEMP%\exehead.tmp" 'upx --best "$%TEMP%\exehead.tmp"' line 
in the beginning of example1.nsi
3. Compile example1.nsi

What is the expected output? What do you see instead?
UPX should compress exehead.tmp correctly, but UPX raise "superfluous data 
between sections" with Unicode NSIS 2.46.5

What version of the product are you using? On what operating system?
Unicode NSIS 2.46.5, WinXP SP3.

Please provide any additional information below.

Original issue reported on code.google.com by roy...@gmail.com on 27 Nov 2013 at 2:52