A JupyterLab extension that allows opening files and directories with external desktop applications.

Reveal in OS-specific file explorer


Open files with dedicated desktop application


This extension is composed of a Python package named jupyterlab-fileopen
for the server extension and a NPM package named jupyterlab-fileopen
for the frontend extension.


  • JupyterLab >= 3.0


To install the extension, execute:

pip install jupyterlab-fileopen


conda install jupyterlab-fileopen -c conda-forge


To remove the extension, execute:

pip uninstall jupyterlab-fileopen


conda remove jupyterlab-fileopen -c conda-forge


If you are seeing the frontend extension, but it is not working, check
that the server extension is enabled:

jupyter server extension list

If the server extension is installed and enabled, but you are not seeing
the frontend extension, check the frontend extension is installed:

jupyter labextension list


Development install

Note: You will need NodeJS to build the extension package.

The jlpm command is JupyterLab's pinned version of
yarn that is installed with JupyterLab. You may use
yarn or npm in lieu of jlpm below.

# Clone the repo to your local environment
# Change directory to the jupyterlab-fileopen directory
# Install package in development mode
pip install -e .
# Link your development version of the extension with JupyterLab
jupyter labextension develop . --overwrite
# Server extension must be manually installed in develop mode
jupyter server extension enable jupyterlab-fileopen
# Rebuild extension Typescript source after making changes
jlpm run build

You can watch the source directory and run JupyterLab at the same time in different terminals to watch for changes in the extension's source and automatically rebuild the extension.

# Watch the source directory in one terminal, automatically rebuilding when needed
jlpm run watch
# Run JupyterLab in another terminal
jupyter lab

With the watch command running, every saved change will immediately be built locally and available in your running JupyterLab. Refresh JupyterLab to load the change in your browser (you may need to wait several seconds for the extension to be rebuilt).

By default, the jlpm run build command generates the source maps for this extension to make it easier to debug using the browser dev tools. To also generate source maps for the JupyterLab core extensions, you can run the following command:

jupyter lab build --minimize=False

Development uninstall

# Server extension must be manually disabled in develop mode
jupyter server extension disable jupyterlab-fileopen
pip uninstall jupyterlab-fileopen

In development mode, you will also need to remove the symlink created by jupyter labextension develop
command. To find its location, you can run jupyter labextension list to figure out where the labextensions
folder is located. Then you can remove the symlink named jupyterlab-fileopen within that folder.