ooo, Thanks for posting this since Pico-8 in general has different save location for web and binary versions. For windows, it would specifically be:
%appdata%\Roaming\pico-8\cdata\werxzy_infinimoes.p8d.txt
(though I can't seem to get your method working for me)
I also HIGHLY recommend changing the fifth and sixth characters to "00" as this is considered the last solved level. Which is used to teleport the cursor to it in level selection when loading the game. This is to avoid getting stuck if you solved one of the levels that were farther down (or doesn't exist in the full game).