Get-FileEncoding

Get-FileEncoding.ps1

function Get-FileEncoding($Path) {
    $bytes = [byte[]](Get-Content $Path -Encoding byte -ReadCount 4 -TotalCount 4)

    if(!$bytes) { return 'utf8' }

    switch -regex ('{0:x2}{1:x2}{2:x2}{3:x2}' -f $bytes[0],$bytes[1],$bytes[2],$bytes[3]) {
        '^efbbbf'   { return 'utf8' }
        '^2b2f76'   { return 'utf7' }
        '^fffe'     { return 'unicode' }
        '^feff'     { return 'bigendianunicode' }
        '^0000feff' { return 'utf32' }
        default     { return 'ascii' }
    }
}

Thanks for your code, but it not always shows truth.

Got working sample: https://github.com/mac2000/WindowsPowerShell/blob/master/Modules/Is-UTF8/Is-UTF8.psm1

Idea from: https://github.com/madx/moreutils/blob/master/isutf8.c

Downside that it will work only with small files.

Thank-you for sharing; this is really helpful