To "convert" a file, you are actually extracting the compressed contents. A .7z file is a container (like a folder) that usually holds the actual .3ds game file inside it. Here is the best way to do it on different devices: Option 1: Using 7-Zip (Windows - Recommended) This is the most reliable method for PC users. Download and Install : Get the free software from the Official 7-Zip Website Locate your file : Right-click your Extract Here
Conclusion
Challenges and Limitations
Leo double-clicked it. The 7-Zip window popped up, displaying a single file inside: rom.3ds. convert 7z to 3ds