I have local datastore on my Windows+Eclipse environment on \war\WEB-INF\appengine-generated\local_db.bin
As far as I understood it uses internal format named "protocol buffers". I don't have external tools to present the file in human-readable format.
I'm using simple "viewer" code like this:
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException
{
resp.setContentType("text/plain");
final DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
final Query query = new Query("Table/Entity Name");
//query.addSort(Entity.KEY_RESERVED_PROPERTY, Query.SortDirection.DESCENDING);
for (final Entity entity : datastore.prepare(query).asIterable()) {
resp.getWriter().println(entity.getKey().toString());
final Map<String, Object> properties = entity.getProperties();
final String[] propertyNames = properties.keySet().toArray(
new String[properties.size()]);
for(final String propertyName : propertyNames) {
resp.getWriter().println("-> " + propertyName + ": " + entity.getProperty(propertyName));
}
}
}