Here are two versions with edits as requested:
Version 1 (sentences 6-17 words):
File extension rfp mainly relates to RoboForm password software. It is used for passcard data. RFP files require RoboForm applications or browser extensions to open. There is no conversion available for rfp files to other formats. Once saved, RoboForm offers to fill passwords when revisiting login pages. Passcards are stored encrypted. Along with other user files, passcards are kept in a folder viewed by selecting a RoboForm menu option. RFP extensions may also apply to other file types not supported by RoboForm programs. RoboForm Passcard Format was originally developed for RoboForm for Blackberry by Siber Systems.
Version 2 (sentences 6-17 words):
The rfp file extension mainly relates to the RoboForm password manager. It is used for passcard information. To open rfp files requires RoboForm applications or browser add-ons. There is no way to convert rfp files into other formats. When a password is saved, RoboForm can automatically fill it in when returning to the same login page. Passcard files use encryption for storage. The user data folder containing passcards and other RoboForm files can be accessed through the RoboForm menu. The rfp extension can also apply to some unsupported file types not handled by RoboForm software. The Passcard Format was first created for RoboForm for Blackberry by developer Siber Systems.
RoboForm