I understand you're looking for a French repack of Monster Hunter Stories Collection (which includes the first game and its sequel) for Nintendo Switch in XCI format.
To install or manage a Monster Hunter Stories Collection "repack" (typically an XCI file containing the base game, updates, and DLC) on a modded Nintendo Switch, you generally use homebrew installers like DBI or Tinfoil. Installation Guide for XCI Repacks monster hunter stories collection switch xci fr repack
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