There are two cases that could cause files to appear to be broken: when the Web server returns file length and when the length is unknown. In the first case, if the file is not completely loaded and the connection is broken, Portable Offline Browser resumes downloading (it is trying to resume from the broken point (Reget feature).)

However with no file length given, there is no reliable way to confirm that the file is completely loaded. In this case, after the connection is broken, the file is saved to disk as it is. If the file is HTML, GIF or JPEG, then Portable Offline Browser looks for the file ending. If it is missing, Portable Offline Browser tries to redownload the file to make sure it is complete.