You can exclude files from a folder session based on criteria other than their names. Click the New button to add an Other Filter Item.
Note Whenever a other filter items are defined, a comment bar appears near the bottom of the folder view. You can click the Other Filters 
button on it to edit these filters.
Note If a file filter determines that a file on one side of the comparison should be hidden but the corresponding file on the other side should be visible, both are made visible and the one that should be hidden will be colored teal (blue-green).
The Exclude protected operating system files checkbox is marked by default.