Moving a downloading file!
That is one thing that is not a good idea: moving a downloading file! I did it accidentally today with a file downloading in Firefox. While the file is downloading, all the data is stored into a second file ".part". To my surprise, the download continued after moving the file and the data continued to be saved in the ".part". Once the download was done though, Firefox couldn't save the ".part" data. Since all the data was downloaded, the whole file was in the ".part". I just renamed the ".part" file to the extension the file was supposed to have and it worked great. All of this was tested with Firefox.