> For the complete documentation index, see [llms.txt](https://help.codex.bio/codex/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.codex.bio/codex/mav/user-instructions/open-experiment.md).

# Open Experiment

![](/files/-M540LQMJPogYcPa6d1X)

On the top left, there are three menus: File, Tools and Help. For more detailed information about the menu items, please see [Main Menu](/codex/mav/user-instructions/main-menu.md).

To open an experiment click, "File" and "Open experiment."

![](/files/-LyaDbpRTrjJ7RoWNrlG)

Click the "Select experiment..." button. A folder selection dialog will request an experiment folder. Please select the experiment root folder to open.

![](/files/-LY1Fxgv0Ol4HhebQxaS)

The latest processing and segmentation runs will be populated by default. To choose different processing and segmentation runs, please click on the drop-down menus and select the appropriate entry among those listed.

You will be prompted to select the Segmentation folder if it exists.