Not that I'm aware of. You would have to reverse engineer the repack somehow in order to extract the file.

It's easier to just install the game, and move the nsp from the emulation folder to where you'd like to store it, although it won't be repacked so the file size will be bigger.

https://kaoskrew.org/viewtopic.php?p=31187&hilit=Super+Mario+RPG

Hello, I recently downloaded Super Mario RPG and when I verify the files before installation they are all good but when I install the game the CRC check says the NSP file is bad.

The Repack Features page says the file is not CRC ...

Thanks so much for all you guys do!