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....
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before opening, did you write TFileStream.Create?
  X : TFileStream;
  Buf : Byte;
  X := TFileStream.Create('C:\Temp.Dat',fmCreate and fmOpenWrite);

If you still have something not working please attach your code.

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tognettmAuthor Commented:
Thanks for the help!  
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