Dear all, I am experiencing problems with boost::filesystem on files that contains a plus (+) sign. Below is a minimal example to test this. the line: boost::filesystem::path p_plus("filename+.txt"); throws an exception if the filename contains a plus. Any help or hints would be greatly appreciated. Best regards, Simon output: ***************** Contents of filename-.txt Filesystem error caught, reason: boost::filesystem::path: invalid name "filename+.txt" in path: "filename+.txt" ***************** source: ************* #include <iostream> #include <cstdlib> #include <boost/filesystem/path.hpp> #include <boost/filesystem/exception.hpp> #include <boost/filesystem/fstream.hpp> using namespace std; int main(int argc, char *argv[]){ try{ boost::filesystem::path p_minus("filename-.txt"); boost::filesystem::ifstream ifs_minus(p_minus,ios::in ); cout<<ifs_minus.rdbuf(); }catch ( boost::filesystem::filesystem_error const &fse){ cout << "Filesystem error caught, reason: "<<fse.what() << endl; } try{ boost::filesystem::path p_plus("filename+.txt"); boost::filesystem::ifstream ifs_plus(p_plus,ios::in ); cout<<ifs_plus.rdbuf(); }catch ( boost::filesystem::filesystem_error const &fse){ cout << "Filesystem error caught, reason: "<<fse.what() << endl; } return 0; } *****************