Generate Mii

Acquiring .rkg file

Visit Ghost Manager

Exporting Mii

Simple drag and drop a time trial .rkg file onto the .exe file.

Alternativaly, you can right click and select "open with" and choose Generate-Mii for the double click.

It will generate the .miigx file along with 2 additional .json files

You only need the .miigx file.

Viewing Mii

You can view your .miigx file on mii-unsecure

Change the input type to Mii data/file/Studio Code

Choose your file and then query