A few extra steps are required to prepare a saved game file that is normally stored internally on an Nintendo 64 game cartridge.
First, use the DexPlorer software to transfer the file from your PC to a standard Controller Pak memory card. Then, use the Memory Card Manager feature of a Game Shark cartridge to transfer the saved game from the Controller Pak to the cartridge's internal memory. Note: Your Game Shark cartridge must be version 2.0 or later to have this feature.
You can reverse the process to transfer, store, or share your internal saved game files.