Trouble accessing ICSharpCode.SharpZipLib.dll in 3rd party software


I am writing a plugin to use within Encompass360 SDK, a loan processing system.

Encompass360 has an interface to upload my .NET dll plugin to this system, which works fine.

I am not trying to use Excel Data Reader to read a spreadsheet that is also uploaded to the system. (Love the Data Reader interface.)

Everything works fine as long as I use the binary reader with 97-2003 format .xls files. However, the file size has grown over 64K, so I am trying to use the OpenXmlReader with 2007 format .xlsx files.

The ExcelReaderFactory.CreateOpenXmlReader(stream) returns an IExcelDataReader, but it's IsValid status is false and the Exception property states that the ICSharpCode.SharpZipLib.Zip.ZipEntry.IsCompressionMethodSupported method cannot be loaded.

Calling AsDataSet() on the data reader returns null.

I try to load the SharpZipLib library directly in my plugin, and it fails completely, so I believe the problem is either with the DLL version, or Encompass360s ability to load this dll (even though it loads Excel.4.5.dll just fine - Runtime Version v4.0.30319 and Version

Both dlls work just fine in a .NET Console application, just not within Encompass 360. I've contacted them -- not a lot of help.

My copy of ICSharpCode.SharpZipLib has a modifed date of 1/2/2014 12:05 PM, a Runtime Version of v2.0.50727 and a Version of

Might you have any ideas how to load this dll to get an OpenXmlReader? Perhaps another version?

BTW, this fails for all .xlsx spreadsheets, even the simplest 1 col 1 row test case I created, so I have not attached one.

Thank you very much.