$test = New-Object System.IO.StreamReader("C:\Users\hogehoge\Desktop\moji.txt") BodyName : utf-8 EncodingName : Unicode (UTF-8) HeaderName : utf-8 WebName : utf-8 WindowsCodePage : 1200 IsBrowserDisplay : True IsBrowserSave : True IsMailNewsDisplay : True IsMailNewsSave : True IsSingleByte : False EncoderFallback : System.Text.EncoderReplacementFallback DecoderFallback : System.Text.DecoderReplace