# Interface - Attachments

This section contains settings for configuring the behavior of the Attachments panel.
The Double-click or Enter on an attachment drop-down list allows you to choose which action should occur during these events. The list contains two options:

- Run attachment: opens the selected file in the program associated with its file type, or executes the file if it is an executable (e.g., an .exe file on Windows).
- Insert link to attachment: for page types that support file links within the note text (wiki pages and HTML pages), this inserts the notation that will be converted into a link to the selected file or files.

The Show hidden folders check box allows you to enable or disable the display of folders that start with two underscores (__). Such folders are considered service folders and are hidden from the user by default. In this version, only one type of hidden folder is created within the attachments folder: __thumb. This folder contains, for example, thumbnail files for images on the page. Plugins may create other similar folders that should not be shown to the user, or use the __thumb folder for their own purposes.

See also:

- Attachments
- Attachments and images
- HTML pages