Bitrix Framework

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: bitrix/modules/main/lib. The same folder is used to connect API when corresponding rules are met.