Why does Japanese text get garbled? Organizing PowerShell's UTF-8, character encoding, and I/O

When I opened a text file in PowerShell, the Japanese characters turned into unrecognizable symbols.Even though it looked ...

The PowerShell script I edited on SharePoint won't run! The culprit was "unauthorized UTF-8 conversion"

IT system administrators and SIers who use PowerShell scripts (.ps1) for work Assumed environment: Windows PowerShell 5.1 (Japanese environment) / SharePoint OnlineIntroductionHello. I am "Mikan," an ...