Hints and tips for exploring the corners of your Windows FSD or File System filter.

Several people have recently asked me about testing “into the corners of the file system”, and this article is an attempt to point out some of the darker corners that you may want to look into while testing file systems and file system drivers. 

In XP the implementation of FltIsDirectory is buggy. This document describes the issue and an opensource fix which pacthes filtermanager with a working solution.