Unattended Installation

Hello

I am using Postgres 9.3.3.1 on Windows (32-Bit Windows 7 Professional).
I use the installer executable postgresql-9.3.3-1-windows.exe
with the option "--optionfile <file>"

The option file has the following content (the ${..} are replaced with
correct values before execution):
#mode=unattended
datadir=${program.base}data
prefix=${program.base}
serverport=${postgres.port}
superaccount=postgres
superpassword=${postgres.passwd}
unattendedmodeui=minimalWithDialogs
servicename=${postgres.service.name}

1) If the "mode" property is enabled to mode=unattended, the installation
works silent but the whole 'data' folder is missing after installation (the
first error message will occur when the server-startup failes after
installation).

2) If the "mode" property is disabled, the Installer interface appears.
Everything is correctly set, I need only to press the <next> button. The
Installation completes correctly.

Why does my unattended installation as described in 1) fail, but 2)
succeeds?

Thank you in advance for the help
Peter.

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