find relpath/__init__.py in search paths

Hi all,
for locating a simple file plus extension i'm using the
locatefile_extended function, which works as expected.
Now, i'd like to search for a file including a relative path, as in
relpath/__init__.py . I can't recursively search for __init__.py alone,
since this (with a different relative path) could appear several times.
I'm not really familiar with the path api functions but i guess there's
some possibility to wade through the search paths.
By the way, i realized that path_eachdo, which i wanted to use doesn't
seem to be available under Windows (linker error).

many thanks in advance,
Thomas

--
Thomas Grill
http://grrrr.org