Is there an Undo for "Exclude"? "Include"????

When I am trying to set up a new session and I accidentally exclude a folder or file, how can I un-exclude it? I was looking for a "include" option under the Actions menu, or a right-click option. <font color="red"> </font> :confused:

[Tim]

Select File Filters from the Session menu (or click the "More File Filters" toolbar button with the subglasses). In this dialog you can remove the incorrect Exclude setting.