Hi, Here is my problem definintion. I am using Microsoft.Practices.EnterpriseLibrary.Logging.dll 4.1 version. It is found that "A GUID might be prepended to the filename of the log file". I did some googling and came to know that this is known issue from the following link http://bloggingabout.net/blogs/erwyn/pages/rolling-file-trace-listener.aspx So how to resolve this. Is there any cleaner approch that i can use. Please do reply. Thanks in advance.