Solved! Working perfectly on Windows now!
About Ubuntu, indeed, it was my mistake. I was about to sleep and I didn’t try it... it goes fine when launched through the console!
Thank you for the reply and for the program! To be honest, it's even kind of surprising that you created the PCK Explorer, which I’ve already used a couple of times before. And right when I finished Until Then and decided to translate it, you came up with this tool… just a coincidence, but I really appreciate it! Thank you for the guide as well.