An N64 game file usually ends in .z64. This is a copy of the game data from the original cartridge.

A .z64 file is a raw, byte-swapped ROM dump of a Nintendo 64 cartridge. Unlike modern optical discs (CD/DVD), the N64 used solid-state cartridges. When enthusiasts dumped these cartridges to digital files, they saved the exact binary data.

If you want, I can provide or troubleshooting steps for a particular game . Let me know how you'd like to proceed!

Do you have a specific device or emulator that requires an ISO? Check its documentation first—most modern software has dropped the need for any format conversion from Z64.

You cannot just rename the file extension from .z64 to .iso. That will break the file. Instead, you need to use a conversion tool. Step 1: Download a Creator Tool

Since N64 games are naturally cartridge-based, you won't find a "native" ISO for a single N64 game. Most users seek this conversion for the following reasons:

Obtain a clean base ISO of a legally owned GameCube game that natively includes an N64 emulator (such as The Legend of Zelda: Ocarina of Time / Master Quest promotional disc). Load the base GameCube ISO into the injection tool.