file format is a proprietary package format specifically designed for the EKA2L1 Symbian emulator
Case Study: The process of using Dumberdore to extract a ROM from a Nokia E7 or 5320. symbian rom rpkg
To create an RPKG from an original Nokia device, you must use a tool like Dumberdore (part of the Dumber project): Jailbreak the Symbian phone to gain system-level access. Open Dumberdore from the phone's menu. file format is a proprietary package format specifically
Emulator Requirement: The RPKG format is specifically designed for the EKA2L1 emulator (available on PC and Android) to replicate the Z: drive (ROM) of original Symbian devices like the Nokia N95, 5800, or N-Gage. Nokia Cooker (The gold standard for S60v3/v5)
RPKG (ROM Package): A dump of the Z drive containing the core OS, built-in apps, and libraries.
To help you further, are you looking to create an RPKG file from a physical Symbian device, or are you trying to install one into an emulator?