Jean-Marc Lasgouttes wrote: > You mean that the file exists but is not readable?
The file exists but is in a non-readable directory. Actually, it does not matter whether the file itself is readable or not (a non-readable file in a readable directory does not lead to problems). I'm not sure what's actually the cause of this. Seems that fs::last_write_time throws an exception when the directory is not readable (but, as Rainer told me, only on some systems). I didn't find an explanation for this in the boost::filesystem docs. Jürgen
