Dear Leandro,
I expect you have found out that SRM already has an integration with NW Folder Mgt. You need to complete the IMG for the same to make use of it. Unfortunately, there are no GA functionalities of NW Folder Mgt in browser.Some Webdynpros available are for the HCM personnel file scenario and are to be used only in that scenario(usage in anyother scenario is not supported). You can make use of SAPGUI iview in portal to integrate the SAPGUI screens of NW Folder Mgt in portal. Or you can plan on bulding own Webdynpro screens and use APIs of NW FM for the business logic.
Best Regards,
Pragya