How do I open a TFileStream

I am attempting to open a TFileStream in order to read/write
one file out to several files.  The problem is that when I attempt to open the stream i incur a access violation.  Where am I going wrong?  Unfortunately the help files are extremely lacking in this area....
tognettmAsked:
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TheSwineConnect With a Mentor Commented:
var
  X : TFileStream;
  Buf : Byte;
begin
  X := TFileStream.Create('C:\Temp.Dat',fmCreate and fmOpenWrite);
  X.Write(Buf,SizeOf(Buf));
  X.Free;
end;

If you still have something not working please attach your code.
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ronit051397Commented:
before opening, did you write TFileStream.Create?
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tognettmAuthor Commented:
Thanks for the help!  
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