Steps to reproduce the problem:
1. Open TC
2. Open any Excel file from TC
3. Close Excel file
4. Open the same Excel file from TC again
5. Excel says: <file> is locked for editing by 'another user': http://dl.dropbox.com/u/17029536/TC_bug/2012-01-20_093727.png
Also in Process Explorer I can see TC process has opened specified file:
http://dl.dropbox.com/u/17029536/TC_bug/2012-01-20_093758.png
I tried the same steps with .DOCX file but problem didn't occur.
File (.XLSX) locked by TC after it is opened
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