Created Unassigned: NPOI Dlls reference at runtime [13476]

Hi,
I am using NPOI dlls for SSIS 2008 development (Reading Excel 2007) and cannot add them to GAC. I need to invoke the dlls using c# code at runtime. The Dlls are located on a file share. It looks like in order to open/read from excel 2007 file i need to refer the following dlls....looks like they are dependent to each other in the sequence mentioned below.

NPOI.OOXML
NPOI
NPOI.OpenXml4Net
ICSharpCode.SharpZipLib
NPOI.OpenXmlFormats

Do i need to invoke all of the Dlls or just NPOI.OOXML to read data from excel file at runtime? if i need to invoke all of them is there a particular sequence order?

Any help will be appreciated.

Thanks.