RSDF is an extension given to files associated with a file hosting service called RapidShare. RSDF files contain links to files that can be downloaded from RapidShare servers. To hide the actual location of downloaded files, the RSDF format is encrypted with the AES algorithm.

RSDF files used by RapidShare web hosting have often been used by RapidShare Manager. Currently, this format is rarely used and is considered obsolete.