[Xymon] dynamic logfile name

Hello!

I have an application that creates everyday a new logfile and I want to monitor it. The manpage for client-local.cfg says:

The file:FILENAME line defines the filename of the file to monitor.  As
with the "log:" entries, a  filename  enclosed  in  backticks  means  a
command  which  will  generate  the filenames dynamically.

My question is: From what version on does xymon support this feature? I'm currently running 4.2.3. And can someone give me an example for the syntax with backticks?

Thanks in advance!

Oliver