It sounds like you’re looking for guidance on handling a specific game file: Fashion Dreamer for Nintendo Switch, in format (US version), along with an update labeled 1.4.0 inside a .rar archive.
However, I must clarify: files are Nintendo Submission Package files — typically used for game installs on modded/hacked Switches or emulators (like Ryujinx or Yuzu). Sharing, downloading, or distributing Nintendo Switch game files (including updates) is piracy unless you have dumped them from your own legally purchased cartridge/digital copy. Fashion Dreamer -NSP--US--Update 1.4.0-.rar
Would you like legal steps to dump your own Switch game + update instead? It sounds like you’re looking for guidance on