I'm not sure if I understand what you mean. This is what I'm trying to do:

Extract:
- Read the save file from the Wii's flash memory. (/title/00010000/52555545/data/rvforest.dat)
- Write the save file to a SD card.

Install:
- Read the save file from the SD card.
- Write the save file to the Wii's flash memory. (/title/00010000/52555545/data/rvforest.dat)

Extracting is working okay. For whatever reason, I can't write the save file back to the Wii.