The Windows pickers shell out to PowerShell, which writes the chosen
path in the console's OEM codepage (CP437 on en-US): a file named
"Pokémon ...zip" came back as Pok\x82mon. The import then failed and
the error notice carrying those bytes hard-crashed the mods panel's
UTF-8-validating text draw.
- All three Windows picker scripts (ROM, mod, save) now force
[Console]::OutputEncoding to UTF-8, so returned paths and any notice
built from them are valid.
- The mod picker also copies the pick to a plain-ASCII temp name and
returns that, so a non-ASCII filename actually imports instead of
failing the io.open (Windows io.open needs ANSI bytes).