Hi GreatMarko, Thanks for your quick response! I was aware of the fact that Windows had this limitation (as many others :-) ) but no Windows system is involved in my network of bittorrents. All the machines I'm using run either Linux or OSX. I'm also having another problem that I used to have when I transferred files between Windows and Linux machines but that I had not had for a long time: whenever I sync files from my backup directory (on a Mac), the permissions (read and write for everybody) change when they are copied in the Linux server. This is a REAL pain because if I change the permissions in the Linux machine to make all of the files read and write again (as they were originally), then Bittorrent Sync believes they are not the same files and starts synching again creating a double for every file!!!!! I know this is an experiment at this point (in fact a truly exciting one). I guess I should assume, however, that no matter how enormously useful and cool this will be in the future, the project is not a mature enough to handle these "real life" problems. I would be extremely grateful to whoever can give me some hints to help me get around these problems. Because of the nature of the data I have, I can't shorten the names of the files that don't meet the requirements of the Windows OS.