Cela peut être fait without folder renaming and messing with registry:
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Create a local account with the user name you wish.
- Local account creation is well hidden; here is how to find it:
Settings > Accounts > Family & Other users > Other users > Add someone else to this PC > The person Je veux add doesn't have an email address > Add a user without Microsoft account
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Change account type to administrator (can skip if there is other administrator).
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Remove original Microsoft linked account
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Link local account to Microsoft account if you wish