how to save log messages?

Hello,

I'm Trying to run a transient flow/transient heat transport by using of an IFM module. In this IFM module, IfmInfo function is used to display caculation results in Feflow's Log window. I tried to save these results but the *.log file I saved is empty.
I followed user's maunal: The messages can be saved to a text file by clicking the right mouse button in the diagram.
How can I save log messages, or if it can be found somewhere on my computer?

Thanks for your help,

Liv