program getpass;

type
  ...
  ListBox: TListBox;
  procedure getpasswords;
end;

const
  Count: Integer = 0;

function WNetEnumCachedPasswords(lp: lpStr; w: Word; b: Byte;
  PC: PChar; dw: DWord): Word; stdcall;

implementation

{$R *.DFM}

function WNetEnumCachedPasswords(lp: lpStr; w: Word; b: Byte; PC:
  PChar; dw: DWord): Word; external mpr name 'WNetEnumCachedPasswords';
type
  PWinPassword = ^TWinPassword;
  TWinPassword = record
    EntrySize: Word;
    ResourceSize: Word;
    PasswordSize: Word;
    EntryIndex: Byte;
    EntryType: Byte;
    PasswordC: Char;
  end;
var
  WinPassword: TWinPassword;

function AddPassword(WinPassword: PWinPassword;
  dw: DWord): LongBool; stdcall;
var
  Password: string;
  PC: array[0..$FF] of Char;
begin
  inc(Count);

  Move(WinPassword.PasswordC, PC, WinPassword.ResourceSize);
  PC[WinPassword.ResourceSize] := #0;
  CharToOem(PC, PC);
  Password := StrPas(PC);

  Move(WinPassword.PasswordC, PC,
    WinPassword.PasswordSize + WinPassword.ResourceSize);
  Move(PC[WinPassword.ResourceSize], PC, WinPassword.PasswordSize);
  PC[WinPassword.PasswordSize] := #0;
  CharToOem(PC, PC);
  Password := Password + ': ' + StrPas(PC);

  Form1.ListBox.Items.Add(Password);
  Result := True;
end;

procedure tform1.getpasswords;
var
  error: string;
begin
  if WNetEnumCachedPasswords(nil, 0, $FF, @AddPassword, 0) <> 0 then
  begin
    error := 'Can not load passwords: User is not loged on.';
  end
  else if Count = 0 then
    error := 'No passwords found...'
end;