> For the complete documentation index, see [llms.txt](https://docs.foundryosd.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.foundryosd.com/foundry-osd/customization/operating-system.md).

# Operating system

Use Operating system selection to control which Windows choices are available during deployment.

## Configure available Windows options

1. Open **Customization > OS selection**.
2. Select the Windows releases, languages, license channels, editions, and default media preference allowed by the deployment standard.
3. Review the resulting selection. Changes are saved automatically.
4. Return to **Start**.

<figure><img src="/files/vyAImIUQSpYWIvEMJxty" alt="Foundry OSD operating system selection controls"><figcaption><p>Define the Windows choices available to the deployment technician.</p></figcaption></figure>

Foundry Deploy obtains available media from the configured catalog and presents compatible combinations to the technician.

See [Catalogs](/reference/catalog.md) for field definitions and [Select Windows](/foundry-deploy/operating-system.md) for the runtime workflow.


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