I cannot inflate zst(zstd) file from Paper Mario Origami King with xtool. With zstd.exe it does unpack just fine:
zstdproblem.png
I was so desperate that I actually downloaded and compiled ALL available zstd versions from github! I am attaching those dll's, zstd.exe and a .zst file itself:
zstdproblem.7z
PS(could it be due to window size - 48k ?)