procedure TForm1.FormCreate(Sender: TObject);
var
 N: PChar;
begin
 memo1.Lines.LoadFromFile('c:\file.txt');
 N := Memo1.Lines.GetText;
 OemToAnsi(N, N);
 Memo1.Lines.Text := StrPas(N);
end;

procedure TForm1.FormCreate(Sender: TObject);
var
 i, j: integer;
 s: string;
 c: set of char;
begin
 c := ['А'..'Я', 'а'..'я'];
 memo1.Lines.LoadFromFile('c:\11.txt');
 for i:=0 to memo1.Lines.Count do
 begin
  s:=memo1.Lines.Strings[i];
  for j:=1 to length(s) do
  if chr(ord(S[j])+64) in c then
  s[j]:=chr(ord(S[j])+64);
  memo1.Lines.Strings[i]:=s;
 end;
end;

const

 ConvertSet: array[0..255] of byte =

 {таблица перекодировки ASCII с альтернативной кодовой страницой 866 в

 WIN 1251. Украинские символы - по кодовой таблице PRINTFXU. Непечатные

 символы заменяются пробелами}

 {основная таблица}

 { 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F }

 {00} ( 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,

 {10} 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,

 {20} 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,

 {30} 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,

 {40} 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,

 {50} 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,

 {60} 96, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111,

 {70} 112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,

 {дополнительная таблица}

 {80} 192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,

 {90} 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,

 {A0} 224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,

 {B0} 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,

 {C0} 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,

 {B0} 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,

 {E0} 240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,

 {F0} 168,184,178,179, 32, 32,175,191,170,186, 32,177,185, 32, 32, 32);

var

 TextString : string[250];

 TextTmpArr : array[0..250] of byte absolute TextString;

 WinString : string[250];

 WinTmpArr : array[0..250] of byte absolute WinString;

 DosFile : Text;

 TextFName : string;

 TextFDir : string;

 WinFName : string;

procedure TMainFm.ConvertFile;

var

 I: Integer;

begin

 AssignFile(DosFile,TextFName);

 ReSet(DosFile);

 while not(EOF(DosFile)) do

 begin

  ReadLn(DosFile,TextString);

  WinTmpArr[0] := TextTmpArr[0];

  for I := 1 to TextTmpArr[0] do

  WinTmpArr[I] := ConvertSet[TextTmpArr[I]];

  Memo.Lines.Add(WinString);

 end;

end;

function ConvertAnsiToOem(const S: string): string;
{ ConvertAnsiToOem translates a string into the OEM-defined character set }
{$IFNDEF WIN32}
var
 Source, Dest : array[0..255] of Char;
{$ENDIF}
begin
 {$IFDEF WIN32}
 SetLength(Result, Length(S));
 if Length(Result) > 0 then
  AnsiToOem(PChar(S), PChar(Result));
 {$ELSE}
 if Length(Result) > 0 then
 begin
  AnsiToOem(StrPCopy(Source, S), Dest);
  Result := StrPas(Dest);
 end;
 {$ENDIF}
end; { ConvertAnsiToOem }
function ConvertOemToAnsi(const S: string): string;
{ ConvertOemToAnsi translates a string from the OEM-defined
character set into either an ANSI or a wide-character string }
{$IFNDEF WIN32}
var
 Source, Dest : array[0..255] of Char;
{$ENDIF}
begin
 {$IFDEF WIN32}
 SetLength(Result, Length(S));
 if Length(Result) > 0 then
  OemToAnsi(PChar(S), PChar(Result));
 {$ELSE}
 if Length(Result) > 0 then
 begin
  OemToAnsi(StrPCopy(Source, S), Dest);
  Result := StrPas(Dest);
 end;
 {$ENDIF}
end; { ConvertOemToAnsi }