The Misc controls allow you to exclude files from a folder session based on criteria other than their names.
1.While in a Folder Merge session, choose Session | Session Settings to open the Session Settings dialog.
2.Click the Misc page.
To override file format associations
The Enabled file formats list lets you override which file formats will be used by this folder session. A file format is listed in bold if its enabled state in this session is different from its global enabled state. You can create a custom file format for use in this session that is not used in the global list.