Jananth, you can use a configuration file to set the filename, but when used in the context of this example, the filename declared in the expression would win out at runtime. Are you trying to define the output folder (rather than the filename) in the config file? If that's the case, you could set a variable to define the output folder in the config file, and append your dynamic filename to that folder name.

Let me know if this answers your question.

hth,

Tim