Absolute path in filtered resources are broken

I have a file which need to be filtered : it references ${project.build.directory}.

After the filtering, I have this kind of absolute path :
(...)
<path value="C\:\\Path\\To
Somewhere"></path>

which cannot be used as a File path.

As far as I remember, this used to work in versions 2.0.x (don't know for 2.1.0).