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By default, calibre stores its configuration data (global settings, plugins, overrides etc) in a directory named %APPDATA%\calibre, where %APPDATA% is a Windows controlled environment variable, which is typically set to C:\Users\<user name>\AppData\Roaming.
The CALIBRE_CONFIG_DIRECTORY environment can be used to override the default location.
If the calibre configuration folder is inaccessible when calibre starts it will run its Welcome-wizard. Amongst other things the wizard tries to build a fresh configuration folder; if it is set, it will try to build it in the location referenced by CALIBRE_CONFIG_DIRECTORY.
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