다른 방법이 있는지는 모르겠습니다만..
복사를 하는 방법은 어떤지요
원래 파일은 그냥 그대로 두고 그 파일을 새로운 파일로 한개 복사하여
복사된 파일의 데이터를 읽어 오는 방법은 쓰는건...
안될려나요?ㅡㅡ;;

Ex.WorkBooks.Open(edt_FileName.Text); ==> 요거를
Ex.WorkBooks.Open(edt_FileName.Text, fmOpenRead);
이렇게 한번 해보세요.

{$IFDEF MSWINDOWS}
  fmOpenRead       = $0000;
  fmOpenWrite      = $0001;
  fmOpenReadWrite  = $0002;

  fmShareCompat    = $0000 platform;
  fmShareExclusive = $0010;
  fmShareDenyWrite = $0020;
  fmShareDenyRead  = $0030 platform;
  fmShareDenyNone  = $0040;

{$ENDIF}

Description

The file open mode constants are used when a file or stream is opened to control how it can be shared.

The TFileStream constructor has a Mode parameter that you can set to one of these constants:

Constant        Definition

fmCreate        If the file exists, open for write access, otherwise, create a new file. Unlike the other constants, which are declared in the SysUtils unit, this constant is declared in classes.pas.
fmOpenRead        Open for read access only.
fmOpenWrite        Open for write access only.
fmOpenReadWrite        Open for read and write access.
fmShareCompat        Compatible with the way FCBs are opened. Do not use this mode in cross-platform applications.
fmShareExclusive        Read and write access is denied.

fmShareDenyWrite        Write access is denied.
fmShareDenyRead        Read access is denied. Do not use this mode in cross-platform applications.
fmShareDenyNone        Allows full access for others.