SSIS 2005 Excel Source: Could Not Decrypt File

Hi,

I have an excel file (.xls) that I need to use as a source in SSIS 2005.
When I have the file opened in Excel then it works perfectly in SSIS, but when I close excel and rerun the package it gives me an error:Could Not Decrypt File

I found a Microsoft support item that suggested to keep the excel opened as workaround, but that's not an option ;-)
The file is not password protected on opening, but some cells are protected (and I don't have the password).

Any suggestions?

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