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Use SetLocaleInfo function, where last parameter is a new system separator.

SetLocaleInfo(
  LOCALE_SYSTEM_DEFAULT,
  LOCALE_SDECIMAL,
  ',');

Eckehard Fiedler wrote:

example might work better, if you change it a bit:

procedure TForm1.Button1Click(Sender: TObject);
const  cs1 : pchar = 'Windows';
begin
    SetLocaleInfo(    LOCALE_SYSTEM_DEFAULT,  LOCALE_SDECIMAL,',');
    SetLocaleInfo(    LOCALE_SYSTEM_DEFAULT,  LOCALE_STHOUSAND,'.');
    SendMessage( HWND_BROADCAST, WM_SETTINGCHANGE, 0, LongInt(cs1));
end;

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