"master~2012-04-26_00.37.10_LibO-Dev_3.6.0alpha0_Win_x86_install-arc_en-US.tar.gz" contains an incomplete soffice.bin, size only 87kB. Replacing with soffice.bin from LibO 3.5.3RC2 (666 kB) heals the problem.
@Rainer, the resource section is missing from all Windows executables when they are built with MinGW, it must be a problem with the platform specific makefile.
@David, Windows resources are generated in WinResTarget but they are not linked to the executables. It never worked under MinGW.
David Tardon committed a patch related to this issue.
It has been pushed to "master":
fdo#49183 link resources to executables
*** Bug 42027 has been marked as a duplicate of this bug. ***