An item with the same key has already been added ( for reading excel files with macros inside )

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What steps will reproduce the problem?
1. Reading a 2003 excel file with macros.

What is the expected output? What do you see instead?
Expect the contents to be read, but instead gets an exception.
"An item with the same key has already been added."

What version of the product are you using? On what operating system?
.Net ver 2 Framework.

Please provide any additional information below.

```

Original issue reported on code.google.com by `cmy...@gmail.com` on 19 May 2011 at 4:59

Start by reproducing the failure with a 2003 Excel file containing macros on .NET Framework 2.0, then locate where the "An item with the same key has already been added" exception occurs while reading it. Done means the file contents can be read without that exception; the issue does not name a source file or test.

Written by the indexing model from the issue text.