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Is your feature request related to a problem? Please describe.
In some scenarios with a large chunk of the user base being Windows users, using the Desktop client for example sync conflict can get created easily via the web interface, other clients or directly via any client software supporting WebDAV by creating files or folders that cannot be synced down to Windows ever.

Describe the solution you'd like
Add a setting to 'enforce windows compatible file names' on the server, so when the user tries to rename/create files/folders that would generate conflict when syncing, the server would prevent the action. This setting should be optional and needs to be turned on explicitly.
Also there is no logic expected to migrate existing data, just to prevent it from the moment on the setting is active.

• [Bug]: renaming file by just changing case leads to strange results (on SMB storage and others) #40690 should be a stretch goal
• define list invalid characters
• [feature] Allow to enforce case insensitive filenames #45130

Describe alternatives you've considered
None, given the fact that the person creating a file/folder might not be the one being affected by it and the affected person might not have the permissions on the system to change the names, i.e. when shared read-only.