[pascal]
type
TMyRecord = record
X, Y: Integer;
B: Boolean;
end;

var
FileStream: TFileStream;
MyRecord: TMyRecord;
begin
MyRecord.X := 100;
MyRecord.Y := 150;

FileStream := TFileStream.Create('C:\MyFile.dat', fmCreate);
FileStream.Write(MyRecord, SizeOf(MyRecord));
FileStream.Free;
end;
[/pascal]

Please also check the Delphi help file. Most objects/components are really well documented there.