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System modules (both standard and downloaded from Bitrix24 Marketplace) are located in the bitrix/modules system folder. User modules may be located in the folder
/local/modules. Such division allows for third party developers to conveniently organize the version control for their implementations by maintaining a standard product update system.
Module files and folder structure for core D7 has remained the same as in the old version of the core.
Module API (classes, logic) in a new core is located in subfolder /lib of the module folder. For example, the path to the Main module is as follows: