Hi Best solution is listen events and read file after the file has changed. If you read file continously, you waste CPU time. If you want to see code sample how to do this, see: https://gurux.svn.sourceforge.net/svnroot/gurux/GXCom/GXMedias/GuruxFile GuruxFile is ATL component that listens selected file or folder and notifies when file changed. Happy coding, Mikko http://www.gurux.org