.csv involuntarily converted to .xls

[numeric-lee]

When I download from Jupyter Lab to my local machine, it involuntarily converts .csv files to .xls

This issue was previously closed on the premise the fault must lie with the browser
[(https://github.com//issues/8019)]

However, I have the same issue. It occurred after I switched from an older version of jupyter lab on WSL to a new installation on windows 11 native.
It does not happen when I download csv files from other web_apps and it occurs with both Chrome and Mozilla Firefox. The Firefox browser worked successfully with the previous version of jupyter lab

My jupyter lab version is 3.5.3 , distribution is through Anaconda Navigator.

Also, I do not believe this issue has anything to do with Microsoft Excel and the file associations. It is not prompted by any Excel interactions and it did not exist until I switched from one version of jupyter lab to another. Currently I need to open each download in notepad++ and save it in .csv format as a workaround

Also, is there a way to programmatically download from within the script

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[JasonWeill]

Thanks for opening this issue! This could be a MIME type issue with the file download; if the Content-Type header is set to a Microsoft Excel type, a browser might choose the .xls file extension.

Have you tried this with JupyterLab 4.0? Does the problem still occur with this newer version?

[krassowski]

For context, the Content-Type is set in jupyter_server/jupyter_server/files/handlers.py.

[numeric-lee]

my handlers.py looks identical to the repo

Using anaconda navigator, I was able to upgrade Jupyter Lab to version 3.6.3. The behavior persists

[JasonWeill]

Not reproducible on macOS with Lab 4.1.0.