Steps to Reproduce: 1. Save an Excel worksheet using the format Microsoft Excel 5.0/95 2. Provide the path to that worksheet to DataSetHelper.CreateDataSet() 3. An ArgumentNullException is thrown from System.IO.MemoryStream.

There isn't much reason for excellibrary to support such an old format, but a better error message might be useful. Is it possible to determine whether the file is in the correct format? If so, perhaps the code could throw some more specific Exception?

I'm using code checked out from the current trunk (r53).

Full StackTrace: at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable) at System.IO.MemoryStream..ctor(Byte[] buffer) at ExcelLibrary.SpreadSheet.Workbook.Load(Stream stream) at ExcelLibrary.SpreadSheet.Workbook.Load(String file) at ExcelLibrary.DataSetHelper.CreateDataSet(String filePath) at TestExcelImport.Program.Main(String[] args) in c:\users\theuser\documents\visual studio 2010\Projects\TestExcelImport\TestExcelImport\Program.cs:line 12 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()

same problem!