How to re-initialize the offline files cache and database in Windows XP
The Offline Files (CSC or Client Side Caching) cache and database has a built-in capability to restart if its contents are suspected of being corrupted. If corruption is suspected, the Synchronization Wizard may return the following error message:

Unable to merge offline changes on \\server_name\share_name. The parameter is incorrect.
(in french : Impossible de fusionner les changements hors connexion sur \\server_name\share_name. Le paramètre est incorrect. )

1 – In Folder Options, on the Offline Files tab, press CTRL+SHIFT, and then click Delete Files

2 – If you cannot access the Offline Files tab, use this method to reinitialize the Offline Files (CSC) cache on the system by modifying the registry. Use this method also to reinitialize the offline files database/client-side cache on multiple systems. Add the following registry subkey:

Key Name: FormatDatabase
Key Type: DWORD
Key Value: 1

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