This is a (WIP) simple extension to open .rpx and .rpl files with Ghidra.
Install the extension using the Install Extensions option inside Ghidra or extract the .zip manually into [GHIDRA_ROOT]\Ghidra\Extensions. Make sure to restart the program after installing.
Once the extension is installed, you can import a .rpx/.rpl file via File->Import File....
cd /path/to/extension
export GHIDRA_INSTALL_DIR=/path/to/ghidra
gradle
Output goes into dist
Based on https://github.com/Relys/rpl2elf