Heya, @bdoux33 , thanks for sharing your report of this! My apologies for the misunderstanding. We've not specifically been informed that it is to do with French versions of Windows, or with Windows set to French - rather, the information we have is simply that the issue is with interactions with Windows itself. My own inference is that it's to do with regional administration settings, after a player had shared a workaround with us.
'In Windows go to Settings / Time and language / Language and region / Administration language settings
In the 'Formats' tab then the 'Additional parameters' button, enter (or reset) the space in 'Symbol for grouping figures'
If that doesn't work, do the manipulation with a random symbol, start the game (you will see your symbol instead of '?' If you have chosen something else) then quit and enter the space again and restart the game.'
Can you give that workaround a go for me as well, and let me know if you see any change in-game? If not, I'll be able to feed that back to our team to help with our investigation. Let me know if I can clarify those steps at all!