mkdir .\baza_utf8
Get-ChildItem baza | ForEach-Object -Process {
   $n = $_.Name
   get-content $_ -Encoding KOI8-R | Out-File ".\baza_utf8\$n" -Encoding utf8
}

# $c=0; $t=$(ls .\baza).Count; while ($t -gt $c) { $c = $(ls .\baza_utf8).Count ; $r = ($t-$c) ; echo $r; sleep 2 }