> For the complete documentation index, see [llms.txt](https://chaoses-ib.gitbook.io/directory-opus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chaoses-ib.gitbook.io/directory-opus/manual/preferences/preferences_categories/miscellaneous/external_tools.md).

# External Tools

This page lets you configure certain external tools which are used by various functions. If you don't configure these the default tools will be used.

* **Text viewer**: The text viewer is used when double-clicking on an unknown file type.
* **Script editor**: The [script IDE](/directory-opus/manual/scripting/script_editor.md) can be configured to use an external editor rather than the internal one.