I'm iterating through a directory on windows (c:\) and it is throwing an exception saying the file isn't found when I call is_directory on it. Here is my code filesystem::path boostdir("c:\\"); // -- make sure the path exists if(!filesystem::exists(boostdir)) { // .. error handle } // -- make sure its a directory if(!filesystem::is_directory(boostdir)) { // .. error handle } filesystem::directory_iterator enditr; for(filesystem::directory_iterator itr(boostdir); itr != enditr; ++itr ) { if(filesystem::is_directory(*itr)) // .. code } filesystem::is_directory(*itr) throws with m_what = "boost::filesystem::is_directory: "c:8f876d52712ede0273c42e26d4af6847": The system cannot find the file specified." I checked and verified the folder does exist, I'm guessing the problem is that the directory is in the format c:folder instead of c:\folder. Thanks, David