WinMerge: how to ignore comments

Question

Hi, I'm using WinMerge to compare java files in folders (including subfolders). I would like to ignore comments when the comparison is done, but I don't know how to do it.

At the file level I've found a switch in the option, so if I compare two files the comments are ignored. However if I compare the folders where those two files live WinMerge tells me that the files are different. Then when I click on the files WinMerge finds out that the only differences are comments and it tells me the files are equal.

Any idea?