svndumpfilter at a node

Hi,

Say I have the following structure

Project
 +-branches
 +-tags
 +-trunk
    +-src
    | +-drivers
    | +-os
    | +-utils
    +-docs
    +-test

I am trying to get dump a repository of the source only consisting of
Project\trunk\src\os.

I have tried doing the following

1) use svndump to get a dump of the whole repository

 sumdump m:\ > project.dump

2) use svndumpfilter to include the node

 cat project.dump | svndumpfilter include "Project\trunk\src\os" >
os.dump

When I examine os.dump with vim, it only contains "empty revision for
padding". It does not contain any actual data.

I read through the red-bean book and it indicated that this is possible,
but I haven't been able to achieve it with various combination of the
above steps.

I am trying to do this with Win32 command line tools.

Any hints would be greatly appreciated.

Many Thanks,

--
Tehn Yit Chin
Embedded System Engineer, AAPL
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