Excel Sample
Read an Excel Spreadsheet in Delphi using OLE
Step 1:
Load the Excel Type Library. You can get at it using Project|Import Type Library. This gives you a seriously long list of choices. Choose Excel Library.

Delphi adds "Excel_TLB.pas" into your imports directory. Add Excel_TLB to your uses clause. Add ComObj too.

Step 2:
Add a StringGrid to your project. In this example, I named it Sg. 
procedure LoadGrid;
var
  R: _Application;
  Sheet: _WorkSheet;
  W: WorkBook;
begin
  R := CreateCOMObject(Class_Application) as _Application;
  W := R.WorkBooks.Open(OpenDialog1.FileName, '', False, '', '', False, True, 0, 0, True, False, '', False, 0);
  Sheet := W.Worksheets[1] as _WorkSheet;
  for J := 1 to 4 do
    for I := 1 to Sheet.Cells.Count do
      begin
        Forms.Application.ProcessMessages;
        A := Sheet.Cells.Item[I, J];
        Sg.Cells[J - 1, I] := A;
        if I > Z then Break;
      end;
  R.WorkBooks.Close(0);
end;
Notes:
Excel can cause all sorts of confusion during this process. For example, a user may have the same file open as read-only. That user may be you if you forgot a Workbooks.Close().
Z is the size of your StringGrid
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